Windows 10: Windows 11 Activation Error code: 0xC004C003

I just paid to upgrade my "Windows 11 Home" to "Windows 11 Pro" via the microsoft app store. However, after installation and restarts, the activation isn't working. I'm receiving error code: 0xC004C003. Also it says "Windows 11 Enterprise" at the top of the activation settings screen not "Windows 11 Pro" for some reason. I have the receipt but can't find any way to contact an actual microsoft support human. Any help would be appreciated.

:)

 

Error code: 0xC004C003


hi im getting activation error Error code: 0xC004C003 on my laptop i bought the laptop brand new from argos last year then did windows update and upgraded to windows 8.1 from 8 i have done the upgrade to windows 10 option but im unable to activate Error code: 0xC004C003 windows when i click go to store it wants me to pay £99 can anyone help

 

Activation fails Error code: 0xC004C003


I had upgraded from W8.1 and Windows 10 was activated. I was under the impression that I didn't need a product key and that my PC would be recognized after doing a clean install. Now I have W10 installed fresh, but get the error code: Error code: 0xC004C003

 

Error: 0XC004C003 while activating Windows 10

Hi,



Thank you for writing to Microsoft Community Forums.



As per the error code 0xC004C003, it seems that you have entered an invalid product key. Please reply with the following details to assist with the appropriate troubleshooting steps:

• Have you recently changed any hardware in the computer?
  
• Which version of Windows is installed on the computer currently?
  
• Have you upgraded the computer to Windows 10 earlier?
  
  

I suggest you to refer the troubleshooting steps mentioned in the article

Activate Windows 10 to activate Windows 10. You can also use the

Activation Troubleshooter to activate Windows.



For more information, I would also suggest you to refer the article to
Get help with Windows activation errors, which contains the information on the error code 0xC004C003 that you are receiving.



If the issue persists, you can get in touch with our Live Technical support team by calling them. Please refer the article

Global Customer Service phone numbers to get the Customer support number as per your country.



Regards,

Nikhar Khare

Microsoft Community - Moderator