I use this program to reset the admin password.
Quote:
* This is a utility to (re)set the password of any user that has a valid (local) account on your NT 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. The bootdisk includes stuff to access NTFS and FAT/FAT32 partitions and scripts to glue the whole thing together.
* Will detect and offer to unlock locked or disabled out user accounts!
* It is also an almost fully functional registry editor!
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http://home.eunet.no/pnordahl/ntpasswd/