If it has a CDROM drive (and it likely does) use a Linux Boot Disk and remove the administrator password/reset the admin password. Here’s one all-in-one solution:

http://home.eunet.no/~pnordahl/ntpasswd/

Or, use a floppy and the procedure outlined here:

http://www.infopackets.com/channels/en/windows/gazette/2003/20031030_reset_windows_2000_admin_password.htm

I’ve used older versions of these solutions to easily reset Win2K/XP passwords on quite a few machines. DO NOT REFORMAT until y’all have tried something along these lines! Losing data can ba a real pain.