No idea where to post this so I'll post it here: When installing XP you arrive at a prompt that asks you to "Personalise your software". At this point you cannot name yourself "Administrator", why not ? I know why you can't at the second such prompt "Who will use this computer ?", its for security reasons, also XP creates an "Administrator" account by default and it won't allow two Administrator accounts. But why will it not allow Administrator at the first prompt ?