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Ferland's avatar
Ferland
Iron Contributor
Aug 14, 2025

Windows 10 not accepting win 7 product key after upgrade

i upgraded from genuine win 7 home to win 10 home with a clean install. Win 10 after updating, stated that i need to activate. I used the key that is on the sticker but i got the error 0x803FA067 (the key being invalid). As far as i know, win 10 silently kept being free for genuine versions of win 7 and 8/8.1. I have not done any major changes to the  hardware (switched from hdd to ssd). Can i still use my win 7 key, or do i need to buy a new one? Thanks in advance

1 Reply

  • Eorku's avatar
    Eorku
    Iron Contributor

    Win7 keys cannot be used to directly activate Win10/11 upgrade installations. You must first complete a compliant upgrade using the official Microsoft upgrade assistant before entering the key.

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