Reinstall XP or be preapred to go into the registry as the main admin account is created when you first install XP or start it up when you buy it from a store.
Apart from that you can look in the contol panel for the User Accounts and change the name there or create a new admin account.
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Or you can run this
http://www.kellys-korner-xp.com/regs...geownerorg.vbs