How can I get full screen in daggerfall?

Use dosbox's scalers to stretch the image(or your monitor if it has such an option), Daggerfall does not support wide screen as it's about ten years too old. Personally I don't like the stretched images and just keep it running at a 4:3 resolution.

This.

Worth noting is that although you get a larger image, proportions are completed screwed up - everyone looks short and fat. I am of the opinion that the black bars are greatly preferable to this.

nvm, the problem was with my laptop. (right click on desktop, graphic properties)