Cannot Activate Windows 10

I recently upgraded to Windows 10 with the help of the installer provided on the website. It upgraded my Windows 8.1 single language to Windows 10 Home single language, but Windows has not been activated. It gives me the following error:

"Activation failed because this device doesn't have a valid digital entitlement or product key. Error code: 0x803F7001"

I tried entering my Windows 8.1 product key but it shows that the key is being used by another PC (which is not true !) 

My Windows was activated before the upgrade with a legitimate product key and I didn't do a clean install then why isn't it activating ? Wasn't it supposed to be a "free" upgrade ?


Question Info

Last updated May 22, 2020 Views 25,410 Applies to:

Try entering the generic product key for your edition:

Home - TX9XD-98N7V-6WMQ6-BX7FG-H8Q99

Click Start, type: CMD

Right click CMD

Click Run as adminstrator

At the command prompt, type the following commands:

slmgr.vbs -ipk xxxx-xxxx-xxxx-xxxx (allows you to replace the current product key with the specified)

xxxx-xxxx-xxxx-xxxx - represents your product key

Hit Enter on your keyboard

Exit the command prompt

Restart your computer

Give it a few days

Windows Insider MVP
MVP-Windows and Devices for IT

16 people were helped by this reply


Did this solve your problem?

Sorry this didn't help.

Great! Thanks for marking this as the answer.

How satisfied are you with this reply?

Thanks for your feedback, it helps us improve the site.

How satisfied are you with this response?

Thanks for your feedback.