How To Fix Windows 10 error 0xC004C003

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Fix Windows 10 error 0xC004C003

Applies to Windows 10

When upgrading to Windows 10, you might see a message that says “This product key didn’t work. (Error code: 0xC004C003).” To fix this issue

Get help with Windows 10 activation errors
Applies to Windows 10

Fix Windows 10 error

Here are some of the most common activation errors in Windows 10, and a few things you can try to fix the problems that are causing them. For additional help with the activation process, go to the product activation article.
Activation error     What it means and how to fix it

Windows 10 isn’t activated after upgrading for free from Windows 7 SP1 or Windows 8.1 Update

If you upgraded to Windows 10 for free and ended up in a non-activated state, try following these steps:

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Go to Start Start button icon, then select Settings > Update & security > Activation.

If your activation status is Connect to the Internet to activate Windows, select Activate to manually activate Windows. If this doesn’t work, contact customer support.

-or-

If your activation status is Windows is not activated, it might mean you didn’t upgrade to Windows 10 before reinstalling. If this is the case, you can buy genuine Windows from the Windows Store to activate successfully or go back to your previous version of Windows, and then use the free upgrade offer to Windows 10.

If you already upgraded and activated Windows 10 and see this activation status after reinstalling Windows, contact customer support.

Notes

This only applies if you haven’t made any hardware changes to your device.

For more info about how to go back to a previous version of Windows, see the section in Recovery options in Windows 10.

Updated from microsoft.com

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