Windows activation error 0xC004C003 after motherboard replacement

MR_PURELLA 0 Reputation points
2026-10-09T12:38:37.38+00:00

I purchased a Windows 10 Pro retail key in 2020 and Windows was activated for years. After replacing my motherboard, Windows activation failed. The current error is 0xC004C003: "The activation server determined the specified product key is blocked." My Microsoft account still shows the device. Please check whether the license can be reactivated or recovered.

Windows for home | Windows 11 | Licensing and activation
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  1. DaveM121 937.6K Reputation points Independent Advisor
    2026-10-09T13:13:22.1033333+00:00

    The error code 0xC004C003 indicates the activation server has found a problem with the product key you are trying to activate Windows with.

    1

    Open the Settings App.

    Go to System - Activation.

    Click the Troubleshoot button and choose 'I changed my hardware', is that process successful, if not, what error is indicated.

    2

    Download the free ShowKeyPlus app from the Microsoft Store.

    On the left of that app, click 'Check Edition', then enter your product key into that app.

    Please provide a screenshot of that app window and please hide your product key in the screenshot.

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  2. Horace Wiggins 535 Reputation points
    2026-10-09T12:57:15.1333333+00:00

    @MR_PURELLA

    Was your Windows 10 Pro activation registered with your Microsoft Account?

    https://support.microsoft.com/en-us/windows/activation/activate-windows

    Search results for, 0xC004C003

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