It does not happen all them time but once in a while when I right click on McAfee Enterprise Anti-virus system tray icon the menu comes up but it's frozen. At this point I notice that shstat.exe is using 50% cpu. Killing shstat.exe does not help. All windows menus are screwed up. They don't seem to come up at all. Only running cursor over them makes the menu items appear. Has anyone run into a similar problem?