Windows Vista uses the new, more stable Windows Display Driver Model (WDDM), which does not allow you to use more than one video driver when you use multiple monitors on a computer. Errors usually occur when you have more than one video card from different manufacturers, including any video support built into the motherboard on your computer.

To use multi-monitor support with more than one video card, all the cards must use the same driver. This usually means using the same video card, or different cards from the same manufacturer (provided that they use the same driver). Most new video cards enable you to set up two monitors using the single video card, so you don't have to use more than one card for two monitors. For more information on using your video card, go to the manufacturer's website. For more information on using multiple monitors, search Help and Support for "multiple monitors."

Popular video card