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 ...
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).
When you need to reinstall Windows, you shouldn't have to spend an entire day installing years of updates, drivers, and necessary software along with it. Here's how to create a Windows installation ...