How to reset windows xp or NT password? You can download a version of Linux called Backtrack 3(BT3), basically it is a version of Slackware Linux that is built with all security tools. For the purpose of this experiment, you can download either the CD version or the USB memory stick version. The tool that you need to unlock XP password is called chntpw, and if you can find a version of BT3, then you can find it in the path
the windows password file can be found at
then you can goto the /WINDOWS/system32/config directory and type
/pentest/password/chntpw -u administrator SAM
you can clear the password of the administrator account.