My friend has a problem with the the righthand mouse button, when clicked puts a grey info menu box on the screen, this being normal. The trouble is the menu sometimes self appears on the screen without the mouse being touched. When going to make a coffee, on his return often finds the menu has self appeared. Or even when starting the computer up when everything has finished loading , the menu can self appear.....

The mouse has been changed from a wireless opitical one, back to a mouse with a cord, both still result in the menu sometimes popping up by its self.

Any ideas ....?