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Here's how to Fix 0xC004C020 activation error in Windows.

Error code 0xC004C020 in Windows usually occurs when there's an issue with the product key activation process. Here are some steps you can try to fix the issue:

1. Check the product key: Make sure that you're using the correct product key for the version of Windows that you're trying to activate. You can find the product key on the sticker that came with your copy of Windows or in the confirmation email if you bought it online.

2. Check the activation status: Go to the Settings app, click on "Update & Security," and then click on "Activation" to check the activation status of your Windows. If it says "Windows is activated," then the error might be caused by something else. If it says "Windows is not activated," then click on "Troubleshoot" and follow the on-screen instructions to fix any activation issues.

3. Check the internet connection: Make sure that your computer is connected to the internet and that there are no connectivity issues that might be preventing the activation process from completing.

4. Contact Microsoft support: If the above steps don't work, you can contact Microsoft support for further assistance. They might be able to provide you with a new product key or help you troubleshoot any other issues that might be preventing the activation process from completing.

5. Use the telephone activation method: If all else fails, you can try using the telephone activation method to activate Windows. Follow the on-screen instructions to activate Windows using your phone.