What Microsoft does, it considers motherboard of a computer as the licensing product of PC, hence as long as your motherboard is same for the PC, you’re licensed for Windows 10. Now you can do a clean install again over the Installed Windows 10 any no of times. How to Make Bootable USB Pen Drive for Installing Windows 10Īfter once you upgraded to Windows 10, your that computer is eligible for a lifetime Windows 10 license.Fix Windows 10 Blue Screen of Death (BSOD) and Internal Power Error.What is $Windows.~BT folder and How to Delete It?.How to Completely Disable Cortana in Windows 10?.Since Windows 10 is being offered free of cost to users as an upgrade, not as a clean install, so users are required to do those step that way. Why this mess-up happens, because as per Microsoft policy, an user must upgrade an existing installation before doing a clean install of Windows 10. Now download Media Creation tool from here.Reinstall Windows 7 or 8 (which-soever applies for you) back to your computer (do a clean install and use your product key which had worked for you previously on Windows 7 or Windows 8) and activate your windows.So, the solution is something which is going to take some time of yours again.

Windows 7 or 8 Product Key Not Working in Windows 10 Trying even a product key of OEM not helping you with activation.

You’ve skipped entering Windows product key option during clean install hoping that Windows 10 would get activated automatically.

You’re trying your Windows 7 or Windows 8 DVD serial key and Windows 10 is not accepting that.

Rather you downloaded ISO from Microsoft website or any other reliable source or by using media creation tool, and did a clean install of Windows 10 over Windows 7 or Windows 8.1. If you just upgraded from Windows 7 or Windows 8 to Windows 10, but you didn’t chose the option path of letting Microsoft do it for you by upgrade reservation and informing you to upgrade.

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