I have re-installed Win 8.1 and other programs using the disk image created in Windows. Under PC and Devices-PC info it tells me "Activation - Windows is activated". When I go to Lock Screen (for example) the message on the screen is"You need to activate Windows before you can personalise your PC". When I try to actvate Windows the message is always "Windows can't activate. Try again later". I believe that this may be why Windows will no longer install updates. I have been to Microsoft 3 times - each time I was told the problem is now fixed but it never has been. I would really appreciate any suggestions.