I am thinking on updating my OS from XP pro 32 bit but I am not sure what BIT version I need for vista. Is it called Vista 32 bit or something else or does it even matter?
It is just called Vista. If you currently have 32 Bit then go with Vista 32 Bit. If it doesnt specifically say Vista 64 Bit then it is 32 Bit and will serve you just fine.