Originally posted by DOTA2000
Well when you create an account and you put a password, there is a way to reset the password by pressing the reset button on the bios chip.
Dont know how to get it but i do know how to get rid of it xD
...This is for the BIOS password not OS passwords.
As said, if your main system administrator is not passworded, then that would probably be his entry point. Though, in Windows XP Home, you can only access the system admin account in Safe Mode...In XP Pro you can access the system admin account in normal mode if you use classic login or ctrl+alt+del.
If he hasn't gained access by simply guessing the password and getting lucky, or simply accessing the system administrator account because it wasn't passworded, then there are a lot of free tools on the Internet he could have used to reset or change the administrator password, like the Offline NT Password & Registry Editor
Comes in both bootable CD and floppy disk versions, and the webpage has a easy to follow, step by step guide on how to do it. All he'd need is a few minutes in front of your PC.