Troubleshoot Windows Activation Errors

If you’re having trouble activating Windows, follow these troubleshooting steps to resolve Windows activation errors.

  1. (0xC004C008) error code

    If you see this error code please contact us, mention you are getting error code 0xC004C008 in your message so we know what needs fixing.

  2. (0xC004F050) error code

    This error code means the key does not match or is incompatible with the edition of Windows already installed.

    For OEM keys:
    You will see this error code if you are trying to upgrade from Home to Pro, or if you are trying to use a Home key on a Pro or higher install.
    (OEM keys do not support upgrades and are to be used during a fresh Windows install by a system builder).

    For retail keys:
    You will see this error code if you are trying to use a Home key on a Pro or higher install. Also if you have an alternative edition installed, such as Home N, a standard Home key will not activate this alternative edition.

    Solutions:
    The main solution to this error code is to perform a fresh Windows install, guides below.
    Alternatively, use a different key that matches the already installed edition.

    Installation guides:
    Windows 10
    Windows 11

  3. Windows update

    Confirm your device is up to date by checking Windows Update and installing any available updates.

    To check for updates, select Start  > Settings  > Windows Update > select Check for updates

  4. Activation troubleshooter

    If you’re unable to activate Windows, the Activation troubleshooter could help.

    To use the troubleshooter, select Start  > Settings  > System  > Activation > select Troubleshoot

  5. Internet connection

    Make sure your computer is connected to the internet.

    To check your network connection, select Start > Settings > Network & internet. The status of your network connection will appear at the top

  6. Restart your PC

    Restart your PC and retry the activation.

    To restart your PC, select Start > Power > Restart 

  7. Activate by phone (if available)

    You may get the option to activate by phone.

    To activate by phone, look in the Activate Windows Now section > select Activate by Phone