Assuming you have a "retail upgrade version" of Windows XP,
and you removed it from your old computer via reformatting
the drive, you may install it on your new computer.
Assuming a retail license (OEM licenses are not transferable to a
new computer), simply remove WinXP from the computer it is currently
on, and install it onto the new one. If it's been more than 120 days
since you last activated that specific Product Key, you'll most likely
be able to activate via the Internet without problem. If it's been
less, you might have to make a 5 minute phone call.
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