Are you *replacing* the system? Or do you plan on running both at the same
Is it a retail or OEM version?
If the other system is getting retired (won't be run,) or (say) you're
formatting and putting Linux on it (or Win98, for instance,) and you have
the retail version, you should be able to activate it on the other PC. Might
require talking to MS and explaining.
IF it's an OEM version of XP, it's tied to the original hardware.
IF it's going to be run on BOTH systems, you need a new license key for the
If you have to ask if your copy of XP is 32 or 64 bit, it's 32.
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Patch from Microsoft:
More info from MS:
(Stolen with pride from Gary Thorn... thanks!)