DW doesn't allow widescreen resolutions (16:9). And at best it allows 800x600, 1024x768, 1280x1024, so 4:3 and 5:4 only.
Alternatively you may be able to let your videocard driver settings to scale the game resolution to your screen resolution. But make sure you make it maintain the aspect-ratio, or circles will look like ovals, and squares like rectangles. There will be black bands on the side of the screen though, a neccessary limitation.
And setting your screen resolution to 16 bit colordepth allows to enable windowed mode.
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