On October 29 the start button and the Windows 10 taskbar stopped working.  I have called Microsoft tech support and chatted online five times but they have not been able to resolve the problem.  Windows 10 worked alright for over a month, but then this problem occurred.  I believe there was a Windows 10 update around that time.  I have Norton Security Suite from Xfinity which I hear sometimes causes problems.  Has anyone else encountered this problem and found a solution?