Then you will need to find out what kinda video card it is. Is it an add-on, or are you using the one built into your motherboard? If it's the one built in to your motherboard, then you should be able to use the Windows XP (or whatever Op system you are using) CD, or if you have a CD for the motherboard itself, you can use that one. Otherwise, if you added the video card on, then you need to find out the manufacturer, i.e. NVidia, ATI, or whomever it is, and what model it is and goto their website and download the driver.