The contrast ratio won't have any effect on the pixellation of the image.

You should do two things. First, download the lastest drivers for your card (even if the updater says you're up to date) from <a href="http://www.nvidia.com">nVidia</a>. I believe they have a unified driver architecture for cards above GeForce4, which means the same driver should drive all recent cards. The other thing to do is to bump up the resolution in the game. Start the game up and from somewhere in the video options you'll be able to display the game at a higher res.