Basically whats the difference? I see some of them on partpicker that say 32/64 bit and others saying just 32 bit or just 64 bit? Ive got one at home right now that says 32/64 bit but ive never used it, as it wasnt mine belonged to a friend. I kept it around in case of need for an extra windows install instead of rebuying it. If one has a 32 bit system does the 32/64 bit package allow me to choose 64 bit in a reinstall of windows or would i need to buy a brand new 64 bit windows?