If one of you is reasonably computer savvy, you can boot the computer from Nordahl's boot floppy or CD. It includes an NT registry editor which can reset the admin password. Last time I used it, there were 3 conditions:
1) You need a PS2 keyboard, the boot disk doesn't load USB drivers.
2) Windows needs to have shut down cleanly.
3) If you're using XP's encryption features, encrypted files will be inaccessible after the password is reset.
There are also commercial tools costing from $40 to $200 or more, and also other ways of doing it for free.
Finally, if you you have multiple accounts on the computer and you can access one of them, you can use tools to reset the Admin password.
Finally finally, if you routinely don't log in as the administrator, you might have an "Administrator" account with a blank password you never knew about, and you can use that login to reset any other user account passwords, of course.
Last edited by Bushfiva; 3rd October 2007 at 08:41.
Reason: Admiring Orac's speedy response. Poop.