For most would-be Windows 7 users, a 64-bit version of Windows 7 is the right move. But if you don’t have sufficient RAM (at least 4GB), or you rely on devices that don’t have supporting 64-bit ...

Yes, IF there are 64-bit drivers for your hardware. Check. *Before* you start the install. (There probably are. But it's a PITA if you don't and you're wrong) Click to expand... Yeah, but that won't ...

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).