As an update I have been playing around and can get it to fill the screen, the problem was that it is just very unresponsive when playing divx movies and the double touch is taking a while to register. When in full screen the audio and video are not in sink, the video is about half the speed of the audio. If I use mediacar it's fine. This is a clean install of XP pro with the divx codecs and mobile impact, am I missing some software? could that be the problem?