I had a Geforce 3 in this computer for the past few months. Everything was well until one day I noticed the Additional Properties button in Settigns was disabled, or grayed out. That card ended up breaking down, so i put in an old TNT 2 card temporarily, I still have it in now. The button is still faded out. I've updated drivers several times and currently am running the most recent drivers from nVidia. How can I fix this? Someone must know.