Adminstrator Account Missing in XP Professional?

macman

Just changed a blown power supply on a PC, and while testing it noticed that the only account is a single Limited User Account. No Administrator Account is showing.
I asked the owner and he said 'yes, my son removed it, can you put it back, because I now can't install anything?
How is this possible, and how can it be put back?
I thought that with XP, if only one account existed, then it had to be an Administrator account?

Mondez

Press ctrl+alt+delete twice at the logon screen and it should give you a screen to type in a user and password rather than selecting from a list. Type administrator for the user and leave the password blank and see if it lets you log on.

John_Gray

Or boot into Safe Mode, and see whether you are given any likely usernames...