Uninstall

I downloaded some large files that required me to move around and delete a lot of default files. Since I didn't pay much attention to what I was doing, I couldn't figure out how to go back to the default files. I figured I'd unistall fs9 and then just reinstall it, but when I tried to do that, it said that it couldn't delete it, but would delete the icon in the add/remove programs file. How do I unistall it??? Thanks