Odd problem with new format..

I just reformatted my computer and installed a windows xp professional on it.. I've used the same disk for two different computers, but on this one, whenever I start it up, it will go straight to the Administrator account. It wont startup to the login screen at all, i've added passwords and made new users, but it still brings me to the admin account..

Any ideas?

XP has an option to do this. Why don't you google.