If you have a 64-bit CPU, you might be itching to try a 64-bit OS. While software support has grown from Windows XP x64 Edition, you'll probably still want to keep Windows XP 32-bit on your hard disk ...

Update: Before you try all of this, you may want to try using WinToFlash, a utility designed to create a bootable Windows flash drive for Windows XP/Vista/7/Server. If this works for you, you can skip ...

I bought a Pro Upgrade license and reading up on it, it looks like the 64-bit version won't upgrade XP 32-bit, but will instead do a clean install (wiping out the XP install in the process).