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Do you have a recovery CD (or a recovery partition) for the machine? That's probably the easiest. If not, then you'll need a copy of XP that corresponds to the key you have and install it manually.
There are tool to reset the password if you want to try that route. Just Google XP password reset. It's a little involved, so if you're not comfortable with doing what they are recommending, I'd just do a reinstall.
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