I had this problem. It fixed itself when Windows Live Mail decided to stop working completely. When I click the icon, the Window Live splash screen displays, the circle "circles", but nothing else happens. If I look in the task manager, the memory
count just keeps going up. I have not tried to uninstall WLM, but I think that is going to be my next step. Sorry to hear others are having similar problems, glad to hear it's not just me.
bitcohen