Otherwise, your key will fail to activate Windows 10. You would need to install the previous Windows of which you have the activation key, then update to Windows 10 and then use your key. This error indicates that you have upgraded to Windows 10 but the previous Windows (the Windows version your key is from) is not installed. This is the most common error that users get when their Windows activation fails. Solution 1: Troubleshooting Error 0xC004F061 After that, we have discussed some other causes and their fixes. Users can face different errors that basically lead to the Windows 10 activation key not working.įirst, we have discussed some of the errors that can cause this problem and also how you can troubleshoot them. This problem can be caused by various different reasons. Solving The Windows 10 Product Key Not Working Issue That’s why in this article we have discussed the various ways in which one can diagnose and troubleshoot this problem. This is a serious problem and can be very distressing for the users.

This problem sadly is still met by many users who try to update from previous Windows versions to Windows 10. After Windows 10 was released, many users who were using the older versions noticed that their Windows 10 product key was not working.

Windows key s not working