ok so I have a problem I just built a computer out of used parts and I have a Windows 7 disk key but it's a 32 bit key . I'm going to be using it for mainly gaming so I need a 64 bit operating system to be able to play them. I have little to no knowledge on operating system and would welcome any suggestions or help . I have found a sale on Windows 10 pro for $14 but it's just the key and not the disk and I don't know if it's the whole operating system or if it's just an upgrade to Windows 10.