Windows 10: Upgraded to Windows 10, but Windows 10 isn’t Activated after a reinstall

When Microsoft rolled out Windows 10, they offered a free upgrade to many from Windows 7 and Windows 8.1. This worked for those who had a valid license of Windows. Users in this scenario when had to reinstall Windows 10 [...]

This post Upgraded to Windows 10, but Windows 10 isn’t Activated after a reinstall is from TheWindowsClub.com.

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How to reinstall Windows 10 if my computers used the free upgrade from 7 and 8?

Will windows 10 still accept the license keys from 7 and 8 now if I reinstall my computer?

Does Microsoft keep a list of users who upgraded to Win 10 using their 7 and 8 keys so that when users need to reinstall windows 10 the old keys would work?

Do I need to call in Microsoft to ask them to activate my Windows 10 when I give them my win 7 keys?

Both computers are laptops. The windows 7 machine had the serial printed on the back, and I needed to enter that when I upgraded to 10. The windows 8 machine had the serial built in inside its boot system so I didn't need to enter the key when I upgraded to 10, but I did manage to write down the keys using a fetcher program.

 

How to reinstall Windows 10 if my computers used the free upgrade from 7 and 8?

Your ild keys should work but if you registered the key to your online ms persona (email address) it should be tied to your account , install without a key login with your credentials , then activate.

 

Windows 10 Activation (Insider)

Like Pill Monster said no more Windows 10 keys for Insiders. It was on Microsoft Blog they said that all that stuff is tied to one machine. You can upgrade anytime but never make a clean install. Those people who upgraded from 7 or 8.1 to 10 can do a clean install of RTM and post-RTM builds. A friend of mine upgraded from RTM to 10533 or whatever the latest post-RTM build is (and it activated just fine).

After all MS isn't stupid to give Windows 10 for free.