Wp Wordpress

Working on a laptop in class, we did just an upgrade from windows 2000 to XP PRO, when we did this now it has the "customers" name and now needs a password, tried just enter and typing admin nothing worked, put a password recovery disc in and it went through until it says to type in path to registry directory, any help on just erasing the password or getting around it or path to the registry directory would help tremendously THANKS, JOE