Xp won't boot after uninstalling service pack 2

[Greybiscuit]

I was trying to repair a friend's computer and uninstalled service pack 2. After uninstall it went to reboot and just began an endless loop and wouldn't reboot. It won't boot to safe mode. When trying to boot off the CD, it asks for the administrator password. The owner has no clue as he has never set an admin password or ever needed one. Any ideas here? If I can boot from the cd I can try system restore as I'm sure whatever I did uninstalling SP2 obliterated the registry in some way. Is there a generic admin password? We tried "admin".
Thanks in advance.

 

[RealBlackStuff]

Welcome to TachSpot

You can try to boot with a blank password, i.e. NO password.
You can also try Admin, ADMIN, administrator, Administrator etc.
Note the use of capitals, passwords are case-sensitive.