If i were to buy a full version retail copy of vista, would I be able to install it on two machines? But not necessarily at the same time though. Because right now I want to get and install vista on my MBP now. And then later I intend to purchase the new imac and make that my primary windows machine. So with a retail copy, I could uninstall windows from the MBP and then install it on the imac once i get that without any activiation issues? Oh, and besides OEM discs, is the only way to purchase a retail copy of a 64 bit version of vista is through Microsoft's site? Because I only see 32 bit versions on Amazon and other places.