Can someone tell me why 32 bit and 64 bit is included with the retail version of Windows 7? I'm sure there is an easy answer i'm not thinking of. I read that if you use the 32 bit in one machine then you can't upgrade to a new machine capable of running 64 and install it from the disc that came with the 32 bit version. If this is indeed true, what in the world is the point? Again i'm sure its something stupid i'm not understanding.