Just for the experience, I tried running an XP install on a (freshly reformatted) spare hard drive here at work. (This is my only XP experience to date.) During the install, it asks for the password to assign to the Administrator account. I left it blank (the way we typically install NT on stand-alone equipment computers). I then had to create at least one user account for the system (I created two called User1 and User2). Now whenever I want to log on to the system, the only options it gives me are User1 and User2. Both are administrator priv by default. If I go into account management, it shows User1 and User2 (and disabled Guest). However, if I try to create an new account named Administrator, it tells me there is already a user by that name.
Under Computer Management / Users, I see Administrator listed (as well as a non-disabled HelpAssistant "Remote Desktop Help Assistance Account" - hmm). But is there ever a way to be able to log on using the Administrator account?