Windows Password Reset Tool

http://pogostick.net/~pnh/ntpasswd/

• This is a utility to reset the password of any user that has a valid (local) account on your Windows NT/2k/XP/Vista/Win7 etc system.
• You do not need to know the old password to set a new one.
• It works offline, that is, you have to shutdown your computer and boot off a floppydisk or CD or another system.
• Will detect and offer to unlock locked or disabled out user accounts!
• There is also a registry editor and other registry utilities that works under linux/unix, and can be used for other things than password editing.