But this activation bug will be revealed to those that have Windows 10 Fresh enabled. Users that update directly from Windows 7 or 8.1 to Windows 10 do not face such a bug.
It is an activation error that means that the server has found that the keys are invalid or that the keys are blocked. So have you taken advantage of the free Windows 10 update for Windows 8.1 and 7 users? Well done, there are also errors and glitches in all new Windows 10 that Microsoft will be working hard to correct, but one of the famous errors that most new Windows 10 users receive is Error code 0xC004C003.