Windows 10: Windows 11 Activation Error code: 0xC004C003

I purchased a machine with pre-installed Windows 10 Pro OEM. I was forced to upgrade to Windows 11 Pro. I swapped a SSD with a bigger one and installed Windows 11. Now it says I do not have a valid licence.

:)

 

help me Windows 11 Activation Error code: 0xC004C003

help me Windows 11 Activation Error code: 0xC004C003

 

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

 

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