Hi, I want to upgrade my 32 bit operating system to a 64 bit OS. My PC was outdated and my hardware in the computer didn't support a 64 bit OS. So I bought a new mobo and CPU that supports a 64 bit OS. Now I want to install a 64 bit version of windows 8 which would upgrade my 32 bit windows XP OS. Now to my question. Which version of windows 8 do I buy the 64 bit full version(OEM) or do I buy a upgrade version.