It is not a good idea to go to windows update for video card drivers. They are never as good as the drivers written for the actual card.
Really? I just downloaded video drivers last week (first time since I got my computer, because I needed the old drivers for a certain game) and as far as I can tell they came directly from NVIDIA. They weren't generic Windows drivers. (According to the video card's properties, NVIDIA is the driver provider.)
-emily