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Here's how to Fix Activation error 0x803fa067, Can’t activate Windows because you don’t have a valid license key on Windows.

Error 0x803fa067 can occur when Windows activation servers are unable to verify your license key. Here are some potential solutions to fix this issue:

1. Check your internet connection: Make sure you have a stable internet connection to access the Windows activation servers.

2. Verify your license key: Double-check that you have entered the correct license key for your version of Windows.

3. Use the built-in troubleshooter: Windows includes a built-in troubleshooter to diagnose and fix activation issues. Open the Settings app, navigate to Update & Security - Activation, and click on the "Troubleshoot" button to run the troubleshooter.

4. Contact Microsoft support: If none of the above solutions work, you may need to contact Microsoft support for further assistance. They may be able to help you verify your license key or activate Windows manually.

To activate Windows manually, follow these steps:

1. Open the Command Prompt as an administrator.
2. Type the following command: slmgr /ipk xxxxx-xxxxx-xxxxx-xxxxx-xxxxx (Replace xxxxx-xxxxx-xxxxx-xxxxx-xxxxx with your product key).
3. Type the following command to activate Windows: slmgr /ato
4. Wait for the activation process to complete.

If none of the above solutions work, you may need to consider purchasing a valid license key for Windows.