That is because this is your Main Board model #. You do not have an AGP graphics card. What you are requesting is the video drivers for your onboard graphics component. Since this was a hand-me-over computer he probably did not provide you with your systems disk. You can try this URL and download all your drivers though I am not sure exactly which model you have, there are several.
http://www.msicomputer.com/product/p_search.asp