Windows 10: The activation key for windows 10 pro gives error 0xC004C003, how to fix?

I bought a phisical key for windows 10 pro, downloaded windows 10 from official site. At the start it asked for the key, i wrote it and windows accepted it. But after the instalation it says that it needs activation, i wrote the key again and it gives me error 0xC004C003. Tryed every slui command, troubleshooting, nothing works. I live in Spain, bought the key here, installed windows 10 pro latest version. The PC is self assembeld, was working before on a non activated version, now i installed it on a new m2 ssd. How can i fix this?

:)

 

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

 

windows 10 activation error: 0xC004C003

Hi,

My intention was not to violate any terms of the software agreement. I did
not modify my GenuineTicket.xml. I recovered this original unmodified file from my backed up image of my Windows 7 Pro, and it has a
TimeStampClient=2015-07-28T23:27:27

I hope Microsoft fixes this GenuineTicket.xml loophole. I also hope they fix the activation error 0xC004C003. What I really have issue is with the error message "The activation server determined the specified product key is blocked". This message
is not at all helpful. People get spooked and mad by this.

If the error message pointed to the page I just happened to finally stumble upon today...this would be
most helpful.

Get help with Windows activation errors - Microsoft Support

Or If the explanation to activation error 0xC004C003 was the following:

"There are a few reasons why you might see this error:

• 
  You performed a clean installation of Windows 10 instead of first upgrading from your previous version of Windows. When this happens, we aren't able to register your entitlement with the activation servers because you aren't upgrading to
  Windows 10. To fix this, you'll need to go back to your previous version of Windows, make sure the previous version is activated, and then upgrade to
  Windows 10. For more info about how to go back to a previous version of Windows, see the section in
  
  Recovery options in Windows 10.
  

• 
  You upgraded to Windows 10, but the activation servers were busy. If you upgraded from an activated copy of Windows 7 or
  Windows 8.1, your copy of Windows 10 will be automatically activated, or you can wait a while and then select
  Activate now. If you performed a clean installation instead of first upgrading to
  Windows 10, see the info on how to fix this problem in the previous item.
  

• 
  You might also see this error if you're using an invalid product key. For example, you can't use a Windows 7 or
  Windows 8.1 product key to activate Windows 10."
  

I do have issues with the phrase that you can "wait a while and select Activate now". How long is a
while? A few days....a few weeks? From the message boards I find it unclear of how long some people have been waiting with error 0xC004C003. I think its been weeks for some?

 

Windows Activation Error 0xC004C003.

Original title: HKohli

I had to clean install Windows 10 due to automatic update installtion errors. Activation is asking for Windows 10 product key which I don't have. I have upgraded to Windows 10 Pro from Windows 7 Pro. Keep getting activation error 0xC004C003.

It seems this is a common problem as several people have reported it on this site. I am hoping it will activate itself in couple of days as suggested by a few.

In the meantime any solution will be helpful to many upgraders to Windows 10.