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Microsoft Windows 7 (32-bit)

Decided to open up my HP g42, needed it to take tests for school rather than buying a new laptop just to take tests. I am going to upgrade memory for windows 11. I have already restored to factory settings.  When I turned on computer it states something about "no serial number" I even looked in specs, and no serial number was there (just a dash). It also states that i may have a counterfit version on windows (it came with laptop).How can I fix this?

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