Forgetting your password is never any fun, but luckily there’s a really easy way to reset the password. All you need is a copy of the Windows installation disk and one simple command line trick.
Resetting Your Forgotten Windows Password
Boot off the Windows disk and select the “Repair your computer” option from the lower left-hand corner.Follow through until you get to the option to open the Command Prompt, which you’ll want to select.
copy c:windowssystem32sethc.exe c:
Then you’ll copy the command prompt executable (cmd.exe) over top of the sticky keys executable:
copy c:windowssystem32cmd.exe c:windowssystem32sethc.exe
Resetting the Password (Final Step):
Once you get to the login screen, hit the Shift key 5 times, and you’ll see an administrator mode command prompt.
net user geek MyNewPassword
Of course, you’ll probably want to put the original sethc.exe file back, which you can do by rebooting into the installation CD, opening the command prompt, and copying the c:sethc.exe file back to c:windowssystem32sethc.exe.