If you forgot your Windows administrator’s password, the bad situation is you can’t
gain access to a computer because you cannot “remember” the administrator’s password.
So what can you do to resolve this problem without re-installing the operating system or formatting the system?
Well, you can always hard to try to remember the login password, if that doesn’t work, you can restore a backed up System State a ERD (in NT 4.0) or (in W2K DC), in which you do remember the password. The problem with doing so is that you’ll probably lose all of the recently add users and groups, and all the changed passwords for all of your users since the last backup was made.