I was wondering something about Windows Vista,Im not planning on upgrading any time soon but today i was looking on newegg at vista ultimate.I notice the one i was looking at was 32 bit version.However that copy was a system builder version.So i was wondering if i get the ultimate edition in the future for use on my current system (32bit) and later upgrade to a 64 bit system that would mean i would have to buy yet another copy of vista for 64bit support?Or would i be able to use the same version and choose between 32 or 64 bit during installation?Thanks