Wednesday, November 23, 2011

Always End With 1089


Always End With 1089

Add two number together and always end with 1089.

Here is How:

Pick a three digit number.The three numbers used must be different*. i.e. 123Reverse that number. 123 becomes 321
Take the smallest three digit number from the largest.
321 - 123 = 198
Take the answer and reverse that number. 198 becomes 891
Add that number to the answer of the subtraction. 891 + 198 = 1089

The answer will be 1089!

So Why does it do this?
Find out here



Why is it always 1089

(This is the reasoning behind Always End With 1089)

You will need a little bit of algebra.
But stick with it, it is not difficult.

Represent the number with ABC
Reverse this to get CBA
Remember that A is Hundreds B is tens and C is units
Take CBA from ABC like this
HundredsTensUnits

ABC

CBA
Now here is the trick: subtract 1 Hundred, and add 9 Tens and 10 Ones (-100, +90, +10 = 0, so won't change answer):

HundredsTensUnits

A-1B+9C+10

CBA

A-1-C910+C-A
Last Step: Reverse the answer and add the two numbers together.
A-1-C910+C-A
+
10+C-A9A-1-C

9189
(simplify:)

1089
As predicted the answer was 1089

Monday, November 21, 2011

Why Transformer rating is in KVA not kW


Why Transformer rating is in KVA not kW


Rating of Electrical Transformer is in VA (Volt Amperes ) because:

Maximum current carrying capacity of the transformer is determined by the thickness of the conductor and Maximum voltage supplied to the winding depends on the insulation strength of the conductor

Manufacturers of Transformers and alternators does not know at what power factor the consumer uses the machine and the nature of the load (capacitive, resistive and inductive) connected to the machine. Hence they rate the transformer depends on the maximum current carry and the voltage to be applied. This rating of the transformer corresponds to apparent power of the machine (VA). Also iron losses in transformer depends on the the voltage applied and copper losses depends on the current flowing through the winding. These losses are independent of the power factor at which the transformer operates.
On the other hand induction motors are rated with real power (Watts) as the machine operating at defined power factor at full load is pre determined. 

Eg: Consider a transformer can carry maximum current of 50A and max voltage applied is 200V. Then
Power rating of the at full load (Unity power factor) = 50x200       = 10kW
Power rating of the at full load (0.5 power factor)    = 50x200x0.5 = 5kW (This means load having 0.5 power factor can connect maximum of 5kW to the transformer. 5kW is the full load of the transformer)

Control Systems Lab Viva Questions


Control Systems Lab Viva Questions

Viva Questions:

1.What is Servo motor?
2.What are the features does Servo Motors possess?
3.What is the difference between AC servomotor and two phase induction motors?
4.Compare AC servo motor and DC servo motors?
5.Some Applications where Servo motors are used?
6.What is Synchro?
7.What is Synchro pair?
8.What are the applications of Synchro pair?
9.What is Proportional Controller? Advantages and Disadvantages?
10.What is Integral Controller? Advantages and Disadvantages?
11.Why Derivative Controller is not used in isolation like Proportional and Integral?
12.For reducing Steady State error which type of controller is used?
13.What is Reset rate?
14.Which type of controller anticipates the error?
15.Explain the behaviour of the system when PID controller is used?

and something u may like....


1.What is Order of the system?


Answer: Order of the system is defined as the order of the differential equation governing the system. Order of the system can be determined from the transfer function of the system. Also the order of the system helps in understanding the number of poles of the transfer function. For nth order system for a particular transfer function contains 'n' number of poles.

2.What is Time response of the control system?

Answer: Time response of the control system is defined as the output of the closed loop system as a function of time. Time response of the system can be obtained by solving the differential equations governing the system or time response of the system can also be obtained by transfer function of the system.

3.How Time response of the system is divided?

Answer:Time response of the system consists of two parts: 1.Transient state response 2. Steady state response. Transient response of the system explains about the response of the system when the input changes from one state to the other. Steady state response of the system shows the response as the time t, approaches infinity

4.What are Test signals and their significance?

Answer: The knowledge of the input signal is required to predict the response of the system. In most of the systems input signals are not known ahead of the time and it is also difficult to express the input signals mathematically by simple equations. In such cases determining the performance of the system is not possible.Test signals helps in predicting the performance of the system as the input signals which we give are known hence we can see the output response of the system for a given input and can understand the behavior of the control system. The commonly used test signals are impulse, ramp, step signals and sinusoidal signals.

5.What is Pole of the system?

Answer: Pole of a function F(s) is the value at which the function F(s) becomes infinite, where F(s) is a function of the complex variable s.

6.What is Zero of the system?

Answer: Zero of a function F(s) is a value at which the function F(s) becomes zero, where F(s) is a function of complex variable s.

Electrical Question: What is Signal Flow Graph? 

Answer: A Signal Flow Graph is a diagram that represents a set of simultaneous linear algebraic equations. By taking Laplace transform the time domain differential equations governing a control system can be transferred to a set of algebraic equations in s-domain. The signal Flow graph of the system can be constructed using these equations.


Electrical Question: What is S-domain and its significance?

Answer: By taking Laplace transform for  differential equation in the time domain equations in S-domain can be obtained.    L{F(t)}=F(s)
S domain is used for solving the time domain differential equations easily by applying the Laplace for the differential equations.

Electrical Question: What are the basic properties of Signal Flow Graph?

Answer: The basic properties of the signal flow graph are:
  • Signal Flow Graphs are applicable to linear systems
  • It consists of nodes and branches. A node is a point representing a variable or signal. A branch indicates the functional dependence of one signal on another
  • A node adds the signals of all incoming branches and transmits this sum to all outgoing branches
  • Signals travel along branches only in a marked direction and is multiplied by the gain of the branch
  • The algebraic equations must be in the form of cause and effect relationship

Electrical Question: What is mathematical model of a control system?

Answer: Control system is a collection of physical elements connected together to serve an objective. The output and input relations of various physical system are governed by differential equations. Mathematical model of a control system constitutes set of differential equations. The response of the output of the system can be studied by solving the differential equations for various input conditions.

Electrical Question: Explain Mechanical Translational System?

Answer: Model of mechanical translational system can be obtained by using three basic elements Mass, Spring and Dash-pot.
  • Weight the mechanical system is represented by mass and is assumed to be concentrated at the center of body
  • The elastic deformation of the body can be represented by the spring
  • Friction existing in a mechanical system can be represented by dash-pot.

Saturday, November 12, 2011

Amazing Keyboard Shortcut Keys


Keyboard Shortcut Keys____by sri vastav





1. Taskbar:

Action---------------------------------Keys
Open the Start menu-------------------Ctrl + Esc
Find a file or folder---------------------F3 or Esc + F3
Minimize all windows--------------------Wins + M

Keyboard Shortcuts For Desktop, Explorer, Folder/Drive Windows, Common Dialog Boxes:

Action-----------------------------------------Keys
Find a file in Explorer or folder window --------------F3
Open drop-down folder/drive list -----------------F4
Move up one level in Explorer/folder window ------Backspace
Refresh or update a window ---------------------F5
Select all items ---------------------------------Ctrl + A
Select multiple contiguous items----------------- Hold Shift + cursor keys
Select multiple noncontiguous items-------------- Hold Ctrl + cursor keys See shortcut menu for selected item------------- Shift + F10
Delete selected item without sending to Recycle Bin-Shift + Del
Open properties sheet for selected item---------- Alt + Enter
Rename selected item ---------------------------F2->change name ->Enter

* Keyboard Shortcuts While Windows GUI loads:

Action----------------------------------------- Keys
Do NOT launch Startup folder executables------- Hold CTRL or SHIFT
Do NOT Autorun the cd-rom --------------------Hold SHIFT


4) More useful keyboard shortcuts (hot "combos") in Windows 95/98/ME:

* Hold CTRL = Copy a file/folder when dragging it
* Hold CTRL + SHIFT = Create a shortcut when dragging a file/folder
* Hold SHIFT = While closing a folder to close its parent folders too
* CTRL + TAB = Move through pages/tabs in a Properties dialog box
* Hold SHIFT = Do NOT Autorun CD-ROM/DVD
* F1 = Help Menu
* F5 = Refresh Desktop settings (with any Desktop icon highlighted)
* F10 = Menu mode
* CTRL + C = Copy
* CTRL + V = Paste
* CTRL + X = Cut
* CTRL + Z = Undo
* DEL = Delete file/folder/shortcut/link
* SHIFT + DEL = Bypass Recycle Bin (permanent DELETE!)
* ALT + ENTER = Properties
* ALT + Double-click = Properties
* SHIFT + Right-click = Show Open With on Context menu
* SHIFT + Double-click = Explore
* SHIFT + Close button (upper right corner X) = Close all open windows
* CTRL + ESC = Display Start Menu
* ALT + ESC = Cycle forward through ALL open (top level) windows
* ALT + SHIFT + ESC = Cycle backwards through ALL open (top level) windows
* ALT + TAB = Move to next active application/window.

In Explorer:

* CTRL + G = Select Go To command
* CTRL + A = Select all files (folders) in highlighted folder (drive)
* CTRL + ENTER = Go to incompletely typed URL name in URL box (valid ONLY for www.?.com URLs!)

*

* BACKSPACE = Go up (back) one level
* SHIFT + F10 = Select right-click Context Menu for highlighted drive/folder/file/link
* Hold SHIFT = Move (instead of copy) highlighted file/folder while dragging it between different drives
* * or + [Numeric Pad only] = expand highlighted folder tree (if it contains any subfolders)
* - [Numeric Pad only] = collapse highlighted folder tree (if it contains any subfolders).

Make Ur Computer Super Computer __By Sri vastav


Make Ur Computer Super Computer__By Sri vastav.


Disable unnecessary programs

When you install some programs they will insert themselves into an area of your registry that will cause them to load when your computer starts up. Obviously this will use memory and slow down your system.

1. Start Regedit.
2. Navigate to HKEY_CURRENT_USER\Software\Microsoft\Windows\Curre ntVersion\ Run
3. Once there, locate any entry's on the right. You can identify the program by the path to the executable. Find programs that you can live without starting up from the list.
4. Right click on them and select Delete
5. You may also want to navigate to HKEY_CURRENT_USER\Software\Microsoft\Windows\Curre ntVersion\ Runonce and HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion \Run.
6. Delete unnecessary programs.
7. Also go to START - PROGRAMS - STARTUP and see if there is anything there you wish to remove.
8. Reboot your computer.


Modify application timeout
The operating system has a set amount of time that a program must be frozen for before it is
timed out. Often this number is set too high, but in some circumstances it is set too low. If
the program is doing a lot of calculations in the background the computer may think that it is
timed out. To prevent this, increase the value of the timeout in the registry.

1. Start Regedit. If you are unfamiliar with regedit please refer to our FAQ on how to get started.
2. Navigate to HKEY_CURRENT_USER\Control Panel\Desktop
3. Select HungAppTimeout from the list on the right.
4. Right on it and select Modify.
5. Change the value to the new timeout value.
6. Reboot your computer.



Open Outlook Express faster
For some users when they remove windows messenger or just disable it from starting up
automatically they experience a great slow down when launching Outlook express. Users who
experience such a slow down will find a error in the system error log saying The server
{FB7199AB-79BF-11D2-8D94-0000F875C541} did not register with DCOM within the required timeout.
The solution to this problem is quite simple. Just Open up regedit and search for the string
{FB7199AB-79BF-11D2-8D94-0000F875C541} and modify the keys InProcServer32 and LocalServer32

default key to a empty string.
Disable unnecessary services to free system resources

Services are programs that run when the computer starts up and continue to run as they aid the operating system in functionality. There are many services that load and are not needed which take up memory space and CPU time. Disabling these services will free up system resources which willspeed up your overall computer experience. I recommend that you sort through the list and read the descriptions to decide if you need that service depending on what you want to do with your computer. Remember, you can always turn the service back on if you find that you need it in the future. Below is the procedure to turn off a service.

1. Click the start button.
2. Select run from the bottom of the right column.
3. Then type services.msc in the box and click ok.
4. Once the services window has loaded we are ready to turn off unneeded services.
5. For instructional purposes we are going to turn off the Portable Media Serial Number service.
6. Find this service in the list and select it with the mouse.
7. Right click and select Properties.
8. Once the properties windows has loaded locate the Start up type drop down box and select disable.
9. Then just click ok and the next time the computer starts the service will not be loaded.


System Settings for a Game Machine
If you are a hard core gamer then the below tweak is for you. Below are a list of windows
services that we reccomend you change to the manual setting. If you do not know how to do that,
refer to our tweak on disabling windows services by clicking here.

Routing and Remote Access
Alerter
Application Layer Gateway Service** (only if firewll is not used)
Application Management
Background Intelligent Transfer Service
ClipBook
COM+ System Application
Distributed Link Tracking Client
Distributed Transaction Coordinator
Help and Support
IMAPI CD-Burning COM Service** (only if do you not use the cd-rw xp record suport)
IPSEC Services
Logical Disk Manager Administrative Service
MS Software Shadow Copy Provider
Net Logon
NetMeeting Remote Desktop Sharing
Network DDE
Network DDE DSDM
Network Location Awareness (NLA)
NT LM Security Support Provider
Performance Logs and Alerts
Portable Media Serial Number
QoS RSVP
Remote Desktop Help Session Manager
Remote Procedure Call (RPC) Locator
Remote Registry
Removable Storage
Server
Smart Card
Smart Card Helper
SSDP Discovery Service
System Restore Service
Telnet
Themes
Uninterruptible Power Supply
Universal Plug and Play Device Host
Volume Shadow Copy
Windows Image Acquisition (WIA)
Windows Installer
Windows Management Instrumentation Driver Extensions
Wireless Zero Configuration
WMI Performance Adapter


Fast User Switching Compatibility ** (only if fast user shiching is not used or the machine have one user only)
Protected Storage
Windows Time
TCP/IP NetBIOS Helper
Task Scheduler
Secondary Logon
Print Spooler ** (only if the pc do not have or use a printer)
Indexing Service
Error Reporting Service
Computer Browser
Internet Connection Firewall (ICF) / Internet Connection Sharing (ICS)


Sacrifice Graphics for Speed
XP is very graphic-intensive which results in a large consumption of RAM. Sometimes to squeeze in the nitty-gritty megs of memory can be, by sacrificing the pretty little bits and colors that are on your screen.
- For starters, reducing the color density and and bit display of your screen will ultimately increase speed to your computer.

1.)On your desktop, right click and go to PROPERTIES.
2.)In properties go to Settings, and set your color quality to the lowest bit-rating (most likely 15 bit). This will reduce color density, and icon quality, but will heavily boast system performance.
- If you really want to increase your system performance, new Windows themes are NOT the way to go, if you are ill-equipped with RAM.

1.) Go into Control Panel and into Performance and Maintenence (If you are using the "classic" view skip to step 2).
2.) Get into System and click on the Advanced tab.
3.) Now click on Performance
4.) Under your visual effects, select CHOOSE BEST PERFORMANCE.
5.) This will undoubtedly increase your system performance by returning XP into Classic Style and  getting rid of the fancy-shmancy fading menus, shadows and whatnot.
Now your graphically challenged computer, has turned into a mean, lean, computing machine.


No more low disk space messages
go into registry with REGEDIT.EXE, go to
HKEY_CURRENT_USER\Software\Microsoft\Windows\Curre ntVersion\Policies\Explorer\
and (if not already there) add DWORD (without quotes) "NoLowDiskSpaceChecks" and change the value to 1. Restart.


Disable auto-reboot
When Running windows and it crashes you will get a blue screen and it will automatically restart,
ofter it will restart too fast for you to see the error message. You could check the error log in
this case but that is too easy. We are going to disable auto restart on system failure.
1. Go to Start -> Control Panel -> System (Windows+Pause works, too)
2. Go to Advanced
3. Under the Startup and Recovery section, click Settings...
4. Under System Failure un-check "Automatically restart"


HDD slowdown when booting
If, like I had , you have a 3min+ or slower boot time where Windows XP seems to sit for 2+ or so minutes with the XP logo doing nothing before everything comes to life, then do the following.
Download Bootvis from www.microsoft.com and run it the next time you boot. Do a 'Trace'
If it shows a very long 'HDD init' time of minutes rather than seconds then this is how to fix it.

This example assumes you have 1 Hard drive on your primary IDE channel and a DVD-ROM(or CD) and CD-R on your two secondary IDE channels.
Go to start > right click on my computer > click properties. Click Hardware > Device Manager.
Go to IDE/ATAPI Controllers. Select primary channel. Right click properties. Click the Advance
settings tab. Then on the device (0 or 1)that does not have 'device type' greyed out select
'disable' instead of 'autodetect'. This should stop windows trying to find a drive that isn't there.
If you have your IDE channels set up differently simply repat the above for the secondary IDE
channel settings.When I did this my boot time went from 3mins 20 to 35 seconds. Clean your prefetch to improve performance.

This is an unique technique for WinXP. We know that it is necessary to wash registry and TEMP
files for Win9X/ME/2000 periodly. Prefetch is a new and very useful technique in Windows XP.
However, after using XP some time, the prefetch folder can get full of rarely used or obsolete
links which can slow down your computer noticeably. My suggestion is: open C(system
drive):/windows/prefetch, delete all files (or at least those more than 3 weeks old), reboot. I
recommended that you do this every month.

Vastav's  Note: Deleting prefetch files too often (Every reboot) can decrease system performance!


Turn off Indexing to speed up XP
Windows XP keeps a record of all files on the hard disk so when you do a search on the hard drive it is faster. There is a downside to this and because the computer has to index all files, it
will slow down normal file commands like open, close, etc. If you do not do a whole lot of
searches on your hard drive then I suggest turnning this feature off:

1. Control Panel
2. Administrative Tools
3. Services
4. Disable Indexing Services


Increase speed by tweaking prefetcher settings
This is an unique technique for XP, which could improve the performance significantly by tweaking
the prefetcher (which is a cache folder).
1. run "regedit";
2. goto [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Contro l\Session Manager\MemoryManagement\PrefetchParameters\EnablePrefetcher];
3. Set the value to either 0-Disable, 1-App launch prefetch, 2-Boot Prefetch, 3-Both ("3" is recommended).
4. reboot.
It should decrease the boot time and the time it takes to load programs. 


Slow network access not always due to Scheduled tasks check
If you have very slow access to your network computers through "My network Places" and have already deleted the Registry entry calling for a check of Scheduled Tasks on the other network computers (documented elsewhere on this site) AND you have multiple network adaptors (i.e. a cable or DSL connection through one NIC and an internal network using a second NIC) check the following.
Right click on "My Network Places", go to properties. Right click on the NIC that your cable/DSL connects to, and chose properties. Select Internet Protocol (TCP/IP), and click on properties.
Click on "advanced", go to "WINS" tab, and chose Disable NetBios over TCP/IP.
When you are back at your Network Connections page, right click on the Broadband selection, chose "properties" click on the networking tab. Again, chose TCP/IP, properties, advanced, WINS, and select "disable NetBios over TCP/IP"

Worked for me!
BTW, I don't use ICS (can never get it configured right) and instead use Sygate for my Connection Sharing, so I can't verify that with ICS netbios is enabled in the broadband connection and the modem NIC.The Wizard might catch it, but take a look just in case.


Disable XP Boot Logo
It is possible to disable XP splash screen, which will slightly speed up the overall boot
process. Be aware that removing the splash screen will also cause you not to see any boot-up
messages that might come up (chkdsk, convert ... ), but if your system runs without any problems
then it should not matter.

1. Edit boot.ini
2. Add " /noguiboot" right after "/fastdetect".
(or check the /noguiboot switch in msconfig on the boot.ini tab)
Upon restarting, the splash screen will be gone. It can be re-enabled by removing the new switch.


Disable Debug Scripting in Internet Explorer :
Don't you hate it when you are browsing a page it asks you "Would you like to debug this page?"
Well here's a nifty and easy way to turn it off. Right Click on Internet Explorer and Click Properties
----- or -----
Open Internet Explorer. Click Tools | Internet Options
Click The "Advanced" Tab
The 4th Item in "Browsing" should say "Disable Script Debugging"
Check it and you are all set! Enjoy a Debug-Free Browsing experience.



Stop Jerkey Graphics

I have for a long time had problems with "jerky" graphics in some 3d games and 3dmark, and have had relativly high cpu loads in idle condition.
The cpu load would pulse from 1-2% up to 10-12%-load with about three-five seconds intervals... (in idle) The jerking has not been due to low perfomance hardware or old drivers and I have had the problems on two seperate systems.
If you are connected to a LAN and have similar problems, this might be the solution:

1.RightClick "MyComputer"
2.Select "Manage"
3.Click on "Device Manager"
4.DoubleClick on your NIC under "Network Adapters"
5.In the new window, select the "Advanced" tab
6.Select "Connection Type" and manuelly set the value of your NIC. (Not "Auto Sense" which is

default.)
7.You should reboot...
On my systems the "jerking" in 3D games was completly gone, and so was the high idle cpu load.

This tip also applies to Win2K.

Sunday, November 6, 2011

How To Crack, Hack or Remove Windows Passwords

How To Crack, Hack or Remove Windows Passwords

windows-password-crack.jpg
Whether you’re feeling a little mischievous and want to learn how to crack Windows passwords for fun or just trying to gain access to your PC because you’ve once again forgotten your password, you have several options to achieve your objective and at the same time, gain some insight into how to better protect your computer against similar methods of cracks and attacks.
If you’d like to learn how to crack Windows passwords, there are multiple methods of doing so – some are easy and some are painstakingly difficult – but each of them comes with their own advantages and disadvantages, strengths and weaknesses, in addition to certain usage restrictions.
So, let’s get cracking and see some of the best ways to crack Windows passwords and gain access to the files on a Windows PC secured by a password.

Windows Password Crack: Method #1. The Easy Way

We’re going to start off with the easiest method hack a Windows password and access a Windows PC, which is using a Linux Live CD to gain access to files on the computer. If all you need are a couple of files to get started with your work and some time until you can remember your password, you can just grab a Linux live CD and gain access to the files without even accessing the Windows operating system. This method will bypass the Windows passwordaltogether.
All you need to do is download your preferred Linux distribution or just get the best one and download Ubuntu‘s Live CD. Next, you will have to burn the ISO file you just downloaded onto a CD. Boot the computer from the CD and select “Try Ubuntu” to get to the Ubuntu desktop environment. It should take only a few minutes, depending on the speed of your computer. After that, you can just grab the files you need from your hard drives, transfer them to a USB drive, print them or just email them to yourself.
how to crack windows password
Depending on your setup, you might need permissions for some of the files and in case you’re finding it impossible to copy or view some of the files, just open up the Terminal window by going to Applications and selecting the Terminal icon in accessories. In the Terminal, type the command
gksudo nautilus
If asked for the password, leave it empty. If you’ve done this right, you should now have access to everything in the Windows drive.
Although this method of cracking the Windows password is quite easy, it does come with a few disadvantages. One main flaw is that you can’t access encrypted files, even when using the special Terminal command. So, if you’re one of those people who like to encrypt everything on their PC or trying to gain access to the PC of someone like that, you will not get very far with this method.

Windows Password Crack: Method #2. Almost Hacking

If you need to gain complete access to the Windows system, and guessing or remembering the password is not an option, you can always crack the Windows password by using some advanced command line instructions and fully access the system. This method will remove the Windows passwordcompletely.
Download the System Rescue Live CD ISO file, burn it to a disc and boot from the CD. Select the default option at the blue screen.
When everything is loaded up and running, you get a command line interface. Type:
fdisk -l
and you can see the drives and partitions on the computer. Select the Windows partition and remember the name, e.g.
/dev/sda3
Run the command:
ntfs-3g /dev/sda3 /mnt/windows –o force
Replace
/dev/sda3
with the partition you noted earlier. Next, use the cd command to navigate to your Windows/System32/config directory:
cd /mnt/windows/Windows/System32/config
In order to get the list of users on the PC, use the command:
chntpw –l SAM
Select the username you want to access, and then type:
chntpw –u "Xstrike" SAM
Replace Xstrike with the username you seek access to. Next, select the first option by hitting 1 and Enter. Doing so will remove the Windows password and ask you to write hive files, so type and it should now ask to restart the computer.
how to hack windows password
how to remove windows password
windows password crack
After you restart, you can now gain full access to the system with the username you chose and more importantly, without a password! Here is another guide to help you through the process.
This method gives you access to the full system after removing the Windows password and you don’t have to get into the hassle of using another operating system to gain access to the file, but it still can’t break encrypted files or folders. If the user has encrypted the entire operating system, the method becomes completely ineffective, but if only a few files are encrypted, you should be able to access all the unencrypted content without restrictions.

Windows Password Crack: Method #3. Full-On Hack Attack

If you’re facing the challenge of an encrypted PC, the only option you have left is to use a brute force attack to crack the Windows password. Now, this can take from a few minutes to hours, depending on the speed of your PC and the complexity of the password, so patience is a must. But, in the end if you are able to find the password, you will gain access to all files – even the encrypted ones. This method will crack the Windows password.
You will need to download and burn the Ophcrack Live CD and boot the computer from the CD. After it loads up all the files, you will be brought to a GUI, where the program will automatically start trying to to crack your passwords. The passwords will start showing up in the top half of the window as soon as they are cracked. When its done with the process, you can exit out of the GUI and reboot the PC in order to use your freshly cracked passwords.
Check out these helpful video tutorials for Windows 7 and windows XP to get more details on how to do this properly:

Windows 7

Windows XP

Although this method works on encrypted files and operating systems, there is still a problem as it can’t crack every Windows password, especially ones that are complicated and have more than 14 characters as that requires a fair bit of processing power that desktops simply can’t manage. You do have a small chance if you’re willing to spend some cash and buy Ophcrack’s tables, which can help in cracking more complicated passwords.

Conclusion

This post is only meant for fun and educational purposes to show you the various methods of how to crack Windows passwords. Hacking into someone else’s private files is not only bad, it is illegal. But you can use the hacks given here to play some tricks on your friends or just in case you forget your password.
Have you ever forgotten your password and tried any of these methods to gain access to your PC? Did you run into any snags while doing so? Give us your feedback and comments in the section below.