I have a cloned copy of Windows 7 Dell OEM on 2 drives in a dual boot situation. Can I upgrade one of them to Windows 8 and still use both if I am not using them at the same time? I also have the Windows Media Center upgrade offer for Windows 8. I really have no reason to do this except to try Windows 8 and media center. I guess what I am asking is.... does the Windows 8 upgrade or WMC de-activate the OEM Windows 7 license?