If you recently upgraded to Windows 11 or reinstalled the operating system, you will experience a Windows activation failure that shows error code 0xc004c003. This problem usually occurs when your system tries to enable the digital product key by activating the operating system with the original product.

We’ll show you a few troubleshooting tips to fix this error and activate your version of Windows 11.

What is the error code 0xc004c003 in Windows 11 Pro?

The license code component in Windows is responsible for accessing the registry and verifying the product key. When access is denied due to incorrect access, 0xc004c003 triggers an error.

Failed key authentication can cause this error, but the reasons for the failure may vary. Here are some tips to help you fix this error in Windows 11.

1. Check your version of Windows

Check out the Windows 11 version

Windows 11, like its successor, is available in many editions: Home, Pro and Enterprise. Most consumer-grade computers come with the home edition installed in the box.

How you installed Windows 11 on your PC The modified version of the operating system may change. If you upgrade, Windows will automatically find your existing edition and install the correct version (home, pro, or organization).

However, if you are Performed a clean installation for Windows 11You may have downloaded the Pro version instead of Home. Unfortunately, you cannot activate the Pro edition with the Home Edition license key.

To view the installed version of Windows 11

  1. Click Won + I To open Settings.

  2. in the System Tab, scroll down and click In Care Of.

  3. Scroll down to the Windows Details section in the right pane. Find it here. Edition Class to see the Windows 11 version installed on your PC.

  4. If your Windows 11 version is compatible with your previous version, go here Adjust three. Below.

If you purchased the Windows 11 Home License key and installed the Pro version, try downloading.

2. Switch from Windows 11 Pro to Windows 11 Home

If you upgrade to the Windows 11 Pro Edition with the Home Edition key, you will encounter activation error 0xc004c003.

There are two ways to solve this problem.

Matching Windows 11 Home Vs. Pro: Which one is best for you?

If you do not want to be overwhelmed by a new update, the download process from Windows 11 Pro involves two steps. To prepare for the crash, you first need to adjust your registry editor and then run the ISO configuration file to complete the download process.

2.1 Adjust the registry to install Windows 10 Home

Modify the current version of Windows 11

  1. Press Won + r Run to open.

  2. Type regedit And click Yes I can To open the Registry Editor. Click Yes When asked by UAC.

  3. Go to the following location in the Registry Editor. You can copy and paste the path in the Registry Editor for easy browsing

    ComputerHKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersion
  4. In the right pane, find and double-click on it Brand name Price.

  5. Type in the popup window Windows 11 Home Single Language.

  6. Click Yes I can To save the changes.

    Edition ID Change Windows 11

  7. Next, find and double-click on Edition ID Price.

  8. Type in the popup window Main Single language.

  9. Click Yes I can To save the changes.

  10. Next, go to Registry Editor

    ComputerHKEY_LOCAL_MACHINESOFTWAREWOW6432NodeMicrosoftWindows NTCurrentVersion
  11. In the right pane, search Brand name Value it and change it Windows 10 Home.

  12. Click Yes I can To save the changes.

  13. Next, find and double-click on Edition ID And switch to Main Single language.

  14. Click Yes I can To save the changes.

  15. Close the Registry Editor.

2.2 Down to Windows 11 Home

Windows 11 is ready to install.

To complete the download process, we will download the ISO file and update the location. Windows Update allows you to reinstall Windows OS without removing your files or apps. Here’s how to do it.

  1. Go to Microsoft Official Windows 11 download page.

  2. Scroll down Download Windows 11 Disk Image (ISO) Class.

  3. Click the drop-down and select Windows 11.

  4. Click on take down Button.

  5. Next, select your language from the drop-down.

  6. Click prove it.

  7. Click on 64-bit download Button. Begin your ISO 11 download for Windows 11.

  8. After ISO is downloaded, open the download folder.

  9. Right-click on the ISO image and select A mountain.

    Install Windows 11 ISO

  10. Windows installs ISO and opens the drive folder automatically. If not, click on DVD drive Under the icon This PC.

  11. In the ISO folder, double-click on it Setup.exe File. Click Yes If requested by UAC.

  12. Click in the Windows 11 Install window Change how the update is updated.

  13. Click Next Not now.

  14. Click next to To continue.

  15. Then, accept notices and license terms.

  16. in the Ready to install Window, check Install Windows 11 Home And Save personal files and apps Optional displayed.

  17. Click Load And wait for the process to complete. Depending on your system hardware, it may take a few hours to complete the upgrade. You may also notice a few reboots during the process, but it is a common behavior.

After restarting, make sure the downtime is successful. To do this, go to Settings> About> Windows Details And check the edition.

Go to Enable Windows 11 Settings> System> Activation. Next, follow the on-screen instructions to activate your Windows 11 version.

3. Enable Windows 11 using Command Prompt

Activate Windows 11 using the command prompt

In some cases, the Microsoft server may not be able to verify and activate your license due to server issues. If activation still fails, you can use Command Prompt to activate your license. Here’s how to do it.

  1. Click The key to the window, And type Semedi.

  2. From the search results, right-click Order And select Run as administrator. Click Yes If requested by UAC.

  3. In the Command Prompt window, type the following command and press Enter:

    slmgr.vbs –rearm
  4. Once the success question appears, click Yes I can And then restart your computer. After restarting, open the activation page and make sure the 0xc004c003 error is resolved.

When the Windows 11 license is first registered, it automatically connects to your computer hardware. This helps to ensure that the Microsoft license is used in the Terms of Service, and that Windows does not have to be activated every time the user is clean.

But if you make major hardware changes, such as replacing your motherboard, Windows will not be able to verify its validity. To solve this, you can use the digital product key or run the troubleshoot to verify and activate Windows. check out Microsoft resources to re-enable Windows 11 after hardware Change for more troubleshooting steps.

Fixing Windows 11 Activation Error 0xc004c003

Microsoft restricts certain personalization and other functions on Windows permissions. To fix the error, check your Windows 11 version and product key, or manually activate the key using Command Prompt. You may also want to verify the validity of your license and, if necessary, upgrade to the correct version of Windows 11.

If nothing else, consider upgrading from Windows 11 to Windows 10 until Microsoft fixes previous bugs and errors.

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