Windows 10 how to recover product key for windows 10, which was graded from windows 7

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My PC had Windows 7 OS originally. I upgraded to windows 10 while it was free. About 6 months ago, the PC got virus and forced me to reinstall the original OS, windows 7. My question is that is it possible to recover the Windows 10 product key, the free upgraded product key, from Microsoft based on the original Windows 7 product key?


Thank you very much for any helps!

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