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?