Possible Duplicate: Windows 7 and Vista Activation FAQ: How do language, version, 64-bit or 32-bit, and source affect ability to install and transfer Windows licenses? I have new system components on the way which equate to a new computer. My current machine config is running Windows 7 Pro Upgrade which I installed on top of Vista Ultimate (retail - not OEM). Can I install the Windows 7 Pro on the new computer? Would this equate to transferring the original OS (Vista) license to the new machine?