Upgrading Win 11 Home to Pro broke activation

CHRISTOPHER HUGHES 20 Reputation points
2025-12-15T01:46:03.5166667+00:00

I recently bought a new laptop with Windows 11 Home.
I wanted the features of Windows 11 Pro and so when I noticed I could upgrade form the MS Store, I took the chance. The purchase went through and the laptop did its thing and when done, I restarted.

Now my laptop is displaying "Activate Windows" on the desktop and the version of Windows showing is Windows 11 Enterprise, not Pro.

"SLMGR /ato" results in 0xC004C003

How do I fix this ?

thanks,

Chris.

Windows for home | Windows 11 | Licensing and activation
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Answer accepted by question author
Estrella721 45,810 Reputation points Independent Advisor
2025-12-15T02:19:24.8266667+00:00

Hi,

Disconnect from the internet

Go to Settings > System > Activation. Click "Change product key," enter "VK7JG-NPHTM-C97JM-9MPGT-3V66T," and hit activate.

Reconnect to the internet and make sure you’re signed in with the Microsoft account you used for the purchase.

Restart your computer and check.

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  1. AI answer

    2025-12-15T01:46:11.8+00:00

    It seems that the upgrade process from Windows 11 Home to Windows 11 Pro did not complete successfully, resulting in your system showing Windows 11 Enterprise instead. The error code 0xC004C003 indicates that the activation server determined that the specified product key is invalid.

    Here are some steps you can take to resolve this issue:

    1. Check Your License: Ensure that you purchased the correct Windows 11 Pro license. If you intended to upgrade from Home to Pro, make sure that the key you received is indeed for Windows 11 Pro and not for Windows Enterprise.
    2. Re-enter the Product Key: If you have a valid Windows 11 Pro key, you can try re-entering it:
      • Open the Settings app.
      • Go to System > Activation.
      • Click on Change product key and enter your Windows 11 Pro key.
    3. Use the Activation Troubleshooter: If the above steps do not work, you can try using the built-in activation troubleshooter:
      • Go to Settings > System > Activation.
      • Click on Troubleshoot to run the troubleshooter and follow the prompts.
    4. Contact Microsoft Support: If you continue to experience issues, it may be best to contact Microsoft Support for assistance. They can help verify your purchase and resolve any activation problems.
    5. Consider a Clean Installation: If all else fails and you have a backup of your data, you might consider performing a clean installation of Windows 11 Pro. Make sure to back up your files before proceeding with this option.

    Following these steps should help you resolve the activation issue and get your Windows 11 Pro activated correctly.

    References:

    AI-generated content may be incorrect. Read our transparency notes for more information.

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