Windows 10 isn’t activated after upgrading for free from Windows 7 or Windows 8.1 Update. If you encounter a non-activated state after upgrading to Windows 10 for free follow below instructions:

  • Click on Start and then select Settings > Update & security > Activation.
  • Choose Go to Store and check if you could see a valid license available for your device. If a valid license isn’t available, you will have to buy Windows from Store.

If there is no Go to Store option on your Activation page, contact your organization’s support.

There was a network problem activating a copy of Windows. (Error code: 0xC004FC03)

This activation error occurs when your PC is not connected to the Internet or when firewall settings on your PC prevent Windows from completing the activation process online. In this case, make sure that you are connected to the Internet and that the firewall is not trying to prevent Windows from being activated. If you still experience this problem, you can try activating Windows over the phone.

The activation server reports that the product key has exceeded its unlock limit. (Error code: 0xC004C008)

This error occurs if the product key you are trying to use on a different PC, or if the key is being used on multiple PCs, but is also used on multiple PCs allowed by the Microsoft Software License Terms. You can resolve this issue by purchasing a product key for each PC to activate its Windows.

You can purchase a product key from the Windows Store by following these steps:

  1. Click on Start and then select  Settings > Update & security > Activation.
  2. Choose Go to Store, and follow the shown instructions to buy Windows.

This product key does not work.(Error code: 0xC004C003)

If you are using an invalid product key, the above activation error usually occurs. You must purchase a new product key. If you purchased a PC with pre-installed Windows, you must contact your PC manufacturer to obtain the original key.

The activation server reported that the multiple activation key had exceeded its limit. (Error code: 0xC004C020)

This activation error occurs when a volume license (a license that enterprises purchase dispurchased from Microsoft to install Windows on multiple PCs) is used on more than one PC as specified in the Microsoft Software License Terms. To resolve this issue, you may need to activate Windows on your PC with a different product key. Your organization’s support staff can help.

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