Right-click on "My computer" and go to "properties". When the window pops up, click on the "Device Manager" tab. Once there double-click on "display adapters" to expand the list. Look for the name of your video card, double-click it. Another window will pop up, click on the "driver" tab. Now, look at the "Driver Provider" it should say the name of your video card manufacturer, if it doesn't or says Microsoft then chances are you have not installed the drivers for you video card.
