Windows 10 not activating.
I keep getting told to activate windows 10 my entering my product key. However, after entering the product key, It is telling me that it still cannot activate. I am also getting Error code: 0xC004C003 abut my product key, but I have no way of contacting the company I bought my laptop from, as it was several years ago. 
August 21st, 2015 8:55am
How did you update your computer?
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August 21st, 2015 9:06am

I got the notification on the Get Windows 10 app, and updated it through there

August 21st, 2015 9:07am

If you updated an activated version of 7 or 8 that way then you don't specify a product key.  Just wait until it is activated.  You may have to revert to your original system and upgrade again.

See http://windows.microsoft.com/en-us/windows-10/why-activate-windows-10

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August 21st, 2015 9:17am

This product key didn't work. (Error code: 0xC004C003)

License could not be found or was invalid. (Error code: 0xC004F034) 		          What it means and how to fix it

          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.
August 21st, 2015 10:29am

Hi,

I just make a supplement, you can use slmgr.vbs /dlv command to check your current system license information.

On the other hand, try to make phone call activation for test.

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August 27th, 2015 3:39am

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