I have been having an annoying problem with right mouse clicks and Windows-E keystrokes for some time on my laptop. Finally, I got disgusted enough to spend the time to research and fix. It turns out that these problems are typically related to context handlers that are instantiated when you do the right mouse click on a file/windows background etc. There is a program from NirSoft called ShellExView which will list these programs that are available to the context menus. It allows you to disable a particular shell extension and test to see if that particular shell extension is causing your problem. One of our network engineers also reported that this happened to him when he had a program he removed (the removal process must be defective) and the context menu item was still available but missing.