Lost Computer Administrator

My computer has no accounts that have the adminitrator privileges. My
computer has Windows XP. When I was setting up accounts on my computer, Anna
was the computer administrator. I made another account called Austin, to
which I also gave administrative powers. When I logged out of Anna, Austin
did not show up. I tried restarting the computer, but still no Austin. Don't
ask why, because even I don't know, but I thought making Anna a limited
account would fix the problem. It didn't. No Austin, and no administrator
account. How can I get an administrator account back?

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