i was wondering what the licenses would do for me if i bought one. do i need a operating system license? is that only for buying in bulk would it be cheaper to buy licenses and then the operating system or do i just need the licenses and not the operating system's i don't know what the licenses are for i want to buy a lot of windows 7 operating systems and i'm trying to find the cheapest way. i am going to build a desktop and i wanted to know about the license if i need one to build a desktop and do i need one for putting windows 7 on my old computer that i want to upgrade. if anybody can fill me in on the licenses that would save me a long conversation with Microsoft's technicians.