I mean open the file "settings.txt" in notepad or similar. There are some lines #resolution 640 400 fullscreen resolution 640 480 fullscreen #resolution 800 500 fullscreen #resolution 800 600 fullscreen #resolution 1680 1050 fullscreen #resolution 640 400 windowed change this to #resolution 640 400 fullscreen #resolution 640 480 fullscreen #resolution 800 500 fullscreen resolution 800 600 fullscreen #resolution 1680 1050 fullscreen #resolution 640 400 windowed and save it. See if it works any better. What I hope will happen is that your monitor will recognize this as a valid fullscreen resolution and will rescale it to fill the whole screen (the game is supposed to be a bit pixelated). If it doesn't, there may be some monitor setting you can change in windows. Otherwise just try your monitor's native resolution (so you will lose the pixelation). You don't really need to mess with the commenting and uncommenting; you can just delete "800 600" (or whichever line is uncommented) and write whatever numbers you want.