When you are installing Windows 10 you may get an activation error code 0xC004C003. The product key that a user has does not work is either invalid or blocked; as a result Windows could not be activated. If you are upgrading your Windows 7 or 8.1 to Windows 10 directly then you would not face this issue. This error generally appears when you are installing Windows 10 freshly on your PS or laptops.

Reasons behind the Error code 0xC004C003

The main reason for this error is that Windows Servers are over packed. Now the question may arise that how can this error be fixed. Here are few ways mentioned below to fix this problem:
  1. In such cases you have to wait for few days, then one fine day you will find that it would get activated by itself. If you notice that before after the upgrade Windows is not activated then there is no reason to worry. Generally there is some delay in activation. Because the servers are busy, in couple of day’s time the issue would be resolved, only if the previous windows version was Original.
  2. The activation server may be spammed. Then in that case you can use the command slmgr /ato. Here also you have to wait till windows is activated and in case you have reinstalled the Windows and you are facing that kind of error then just keep trying and clicking in order to activate windows.  
  3. Reinstall your previous version of Windows and then upgrade it to Windows 10. Instead of doing a clean install of Window 10. You can avoid the Error code 0xC004C003 by using the Go back feature and then reinstall it by using the windows 10 app icon from the taskbar. In this way Windows 10 would get activated automatically.
  4. Perform a reset from Windows 10 from the settings then Updates and security and select recovery.

If still you are facing the problem then in that case you can fix it by using PC Error Repair Tool. It is professional software which would help you to enhance the performance of your PC and at the same time fix all the errors that is related to your PC.
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