After back to Windows 7, my activation key is no longer valid

Recently my computer automatically updated itself Windows 10, after a few days, I wanted to go back to Windows 7. I used the built in recovery functionality in Windows 10 restore to Windows 7. Everything was normal until today that I started getting an error message saying that my copy is not genuine. I used the Windows diagnostic tool but it still says that my copy is not valid.

I bought this computer second hand from someone so I don't have the original disks and before I updated to Windows 7 and when I was using Windows 10 I don't have the error. All the solutions or should I just called Microsoft?

How to: fix Windows 7 or Windows 8.1 active or true reports after cancellation of Windows 10

Tags: Windows

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