Changing the registered user in windows XP WITHOUT FORMATTING?

hi,

anybody know how to change the registered user in windows XP WITHOUT FORMATTING.Changing the registered user in windows XP WITHOUT FORMATTING?
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http://xphelpandsupport.mvps.org/how_do_鈥?/a>Changing the registered user in windows XP WITHOUT FORMATTING?
I don't think that's possible. (Without hacking)