The Mother Board

ok this is a very nit-picky problem, but a problem for me none the less. In win 7 playing games in window mode there is the window bar on top of the window. I cant seem to get ride of this so it ends up cutting of the last bit of teh bottom of the window. Vista allowed me to drag window up and hide the window bar but 7 just resets when I try that. Is there a way to streatch a windowed game to fit as if it were full screen??