Reset Windows Passwords Using Commad From Administrators Account
If you cannot log on to windows using a particular user account, and you can log on to it with another one and it got Administrative Credentials, follow the simple steps below
Log on to Windows by using an administrator account that has a password that you remember. You may need to start WinXP in safe mode.
Click Start, and then click Run.
In the Open box, type control userpasswords2?, and then click OK.
Click the user account that you forgot the password for, and then click Reset Password.
Type a new password in both the New password and the Confirm new password boxes, and then click OK.