Son added password protection to WinXP

My two kids share a computer with Windows XP. My 18 year old has set it so you need to put in a password to load his profile at startup. Now I can't view his files and folders. Before I have to beat it out of him is there a way I can go in to view his folders, etc.? I have administrator rights as I set up my own profile as well as my other son's on their computer. Thank you for any suggestions.

 

If you are admin and he won't let you in threaten to delete his profile. Is it a guest account? If so go into user accounts in Control Panel and change his password, that'll learn 'im.