How to Change a Windows XP NT 2000 Password Without Knowing the Original Password

Here are instructions for changing the Windows XP/NT/2k password, Administrator or any other user, without knowing the original password.

Steps
Method 1
Get the [ Offline NT Password & Registry Editor] boot CD from windowspasswordsrecovery.com
Burn the .iso to a CD
Restart the computer and boot to the CD (if it does not already boot to CD then you need to change the boot order in the BIOS or use a boot menu)
Follow the instructions on screen
Method 2
Make sure that the computer is shut down.
Start the computer.
Continuously press 'F8' until a new screen shows up
Select anything that has the words "command prompt" or "DOS" in it. Do not use safe mode unless every choice that says "command prompt" or "DOS" involves starting up safe mode. (See Tips)
Choose the username that you'd like to change the password.
Type net user (here type the username that you want to change) * Example: net user BOB *
Type the new password.
Retype the password.
Restart the computer normally. You can do this by typing "shutdown -r" (no quotations.) Your new password should be active.

Method 3
Windows XP and further versions also provide another method to recover forgotten password by using “Reset Disk”. If you created a Password Reset Disk in past, you can use that disk to reset the password. If you logged on to the computer by using an administrator account, follow these steps to create a password reset disk for a user account:
Click Start, and then click Control Panel.
In Control Panel, click User Accounts.
In the User Accounts pane, click the account that you want to work with.
Under Related Tasks, click Prevent a forgotten password to start the #Forgotten Password Wizard, and then click Next.
Insert a blank, formatted disk into drive A, and then click Next.
In the Current user account password box, type the password for the user account that you chose in step 3, and then click Next.
The Forgotten Password Wizard creates the disk.
When the Progress bar reaches 100% complete, click Next, and then click finish.
Remove and then label the password reset disk. Store the disk in a safe place.

To know more about it, please visit following links: http://support.microsoft.com/kb/305478/
Method 4
Get windows password reset 6.0
Download ISO file from windows password reset
Burn to a CD using a CD burning tool such as Nero or Roxio or MagicISO
Insert CD into drive and reboot.
You may have to select an option in the BIOS to get the computer to boot from the CD.
Booting up and clearing a password takes a minute or two works like a charm.
Method 5
Download an .ISO image file from //sn.im/opu. Note that the .ISO image file included in Windows password Unlocker
Decompress the windows password unlocker and user the BurnCDCC.exe (a burner software) to burn the .ISO image file to a blank CD. Or use your favorite burner software such as Nero, Sonic, or Roxio to burn the ISO file to CD/DVD.
Insert the newly created password recovery disk to the locked computer and reboot it from CD drive
Select the account you want to reset it, and press "next". Just a few steps. The password will be removed

Tips
If you use safe mode, you'll need to log in to an administrator account. Most people have leave their administrator account on without a password. If it is passworded and there is no other way to get access to the computer, try method 1.