I had that problem with my Dell laptop when I first got it almost two years ago. Dell gave me the same advice of reinstalling the drivers, pulling the card and re-seating it. They insisted for about a month that my card was just loose. Finally ended up having to return it and get a new one after many re-installs of Vista.
You might want to try re-seating the card first, but it may just have gone bad like mine did. There was never really a clear answer as to why it happened but it was also after an update.
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