It sounds like you simply need to install the video card drivers from the supplied disc or the manufacturers website.
However, it shouldn't have anything to do with your HD being filled up. What size is it? What is on it?
Any drivers messed up when I do it, from disc and manufacturer. I want to format because I'm guessing my display driver files are screwed up and I should format, my hard drive is a 500GB, I have 200GB left and I have only like 8 games installed and 5gb of music. It shouldn't be that filled up.