Member Avatar for Ritesh_4

Hello.
I've recently upgraded a Windows 8.1 Pro (OEM) to Windows 10 using the Media Creation tool since I was not getting the GWX icon. Activation has been successful from the OEM key. However, there were some registry issues from the Win 8.1 install itself, and these are still present despite the upgrade, and thus I would like to know whether if I format and clean install Windows 10 directly on the PC, will I be able to activate automatically again, or do I need to purchase a Win 10 key?

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Short answer: yes. As and note, once your Windows 8.1 OEM was upgraded and Windows 10 shows as activated on that PC, Microsoft records a digital license tied to that machine. A clean install of the same Windows 10 edition on the same hardware will normally reactivate automatically — you do not need to buy a new Windows 10 key for that device. (support.microsoft.com)

Practical checklist before you wipe (keeps the reinstall smooth):

  • Confirm current activation: Settings > Update & Security > Activation; note whether it says “activated with a digital license” or “linked to your Microsoft account.”
  • If the digital license is not linked, sign in with a Microsoft account on the PC and add it (this lets you use the Activation troubleshooter later if needed).
  • Back up files and create Windows 10 installation media with the Media Creation Tool. (support.microsoft.com)

Clean-install tips
During setup choose the same edition you had (Home vs Pro) and, when asked for a key, pick “I don’t have a product key” (or skip). Once online the OS should contact Microsoft and activate using the stored digital license. If something fails, run Settings > Activation > Troubleshoot or sign in to the Microsoft account you linked and use the “I changed hardware on this device recently” path. (support.microsoft.com)

Caveats and troubleshooting
Major hardware changes (especially a motherboard swap) can break automatic activation; OEM/retail differences matter (OEM is tied to the original device). If activation fails after a legitimate reinstall, try the Activation troubleshooter, enter your prior product key if you have one, or contact Microsoft support. Note: Windows 10 reached end of support on October 14, 2025, so consider upgrade options if ongoing updates are a requirement. (support.microsoft.com)

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Member Avatar for Reverend Jim

Once you have done the upgrade to Windows 10 your computer is registered with some sort of digital ID with Microsoft. At that point you can do a clean re-install of Windows 10 and you will be automatically recognized as legitimate.

commented: This is what I'm seeing too. +0
Member Avatar for oalee

I worked with Microsoft Windows Technical Support for a little over 4 yrs. I was also part of the launch of Windows 8, 8.1 and 10. What Reverend Jim mentioned is correct, Windows 10, especially those who upgraded from a lower version of windows, are automatically registered using a Hash of your hardware IDs (don't ask how it is computed, I don't know too). When you reinstall using a downloaded ISO burned on a DVD or from a bootable USB, it should automatically register it as a genuine copy.

So the short answer to your question is YES.

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