Boot Camp supports XP Home and Pro, 32-bit. Your existing licence is most likely valid for one computer, so you will need to remove it from whatever it's currently installed on.
Boot Camp supports XP Home and Pro, 32-bit. Your existing licence is most likely valid for one computer, so you will need to remove it from whatever it's currently installed on.
The 64-bit version will boot into the installer, and it'll probably install and run too, but Apple say not to use it and there are probably no drivers for it.
It has to be SP2. If you have an older disc of XP laying around, you can slipstream the SP2 updates onto it. It will NOT work with a disc from, say, Dell or HP-- those are specialty discs filled with "Value Added Software" and more than likely will not work.
The 64-bit version will boot into the installer, and it'll probably install and run too, but Apple say not to use it and there are probably no drivers for it.
Let me put it this way: You'd have to go out of your way to buy the 64-bit version of XP. I've not seen it in stores, actually. If it doesn't say that it is WinXP 64-bit edition, then it isn't.