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Microsoft Licensing FAQ
Q. My customer bought a new PC and wants to move the OEM software from the old PC to the new one. Can't users do whatever they want with their software?
A. The OEM software is licensed with the computer system on which it was originally installed and is tied to that original machine. OEM licenses are single-use licenses that cannot be installed on more than one computer system, even if the original machine is no longer in use. The End User Software License Terms, which the end user must accept before using the software, states that the license may not be shared, transferred to, or used concurrently on different computers. System builders must provide end-user support for the Windows license on computers they build, but cannot support licenses on computers they didn’t build. This is a fundamental reason why OEM System Builder licenses can't be transferred.