If Windows were activated on the mini PC and then you installed SM X, you may be able to reinstall Windows by contacting user support. As I found out by searching on internet, "No, you cannot transfer the OEM key to another computer. Manufacturers use these keys to install Windows on any prebuilt PC." So I just activated my Windows copy on the mini PC I bought and then installed SM X. Hopefully I could install it again if I decide to return to Windows on the same mini PC.

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