Forgive me if I'm missing a point and 'trying to teach you to sucks eggs', but have you selected the full screen view option (press alt-enter)?
Assuming that works, you'll need to appreciate that expanding a small-scale video display to full screen size will unavoidably seem relatively low quality (a bit like watching a TV screen close up).
I'd be interested to know how you get on. Depending on what you see on screen, we may have some other ideas to suggest. HTH.