Sorry, that was supposed to be TV which you listed anyway.
Looks like you're running an SD signal into an HD monitor. Not much you can do to clear up the image. The S-Video will give you a slightly crispier picture than the composite RCA jacks but you may not be able to tell the difference anyway with a 1080p monitor.
You either need to get an upscaler ($150) or the HD satellite receiver to really get a clear picture.