on windows XP 64? Ouch. I suspect you might possibly be screwed in that scenario. You "might" be able to copy the directory, but there are probably a few registry keys you would have to build manually.
unless you absolutly have to stay at XP 64 bit, I'd move to 7 if I were you. XP 4 bit is actually slower than XP 32 bit except for when a true 64 bit application is in play. Windows 7 does not have that drawback.