First, try Perry's suggestion of changing your Hardware Edge Smoothing to High.  There is a bug with some video card drivers that can cause this problem.  Turning the edge smoothing to high should also make your views look better and probably won't affect performance in a noticeable way.   If that doesn't work, I would try Michael's suggestion of updating your video card drivers.   If neither of those solutions works for you, you can always manually turn off or on individual