Currently I have a desktop running with windows XP. I also have monitors hooked up, both connected to my ATI Radeon HD 3400 Series video card. I would like to have an additional third screen and I would like to connect this to my VGA port. However, when I do it, the computer starts up and uses the VGA port only. Is there a driver or some settings I can configure so that I can use both the graphics card and the VGA Port?