Check Your Graphics Driver
Being on support I would say that somewhere between 75% and 90% of the calls that come in are graphics driver related. Remember that even if you bought a big brand new machine from Dell it is probably loaded with the wrong driver from the factory. Just because it is new does not mean its correct or certified. So to save some time in your busy day go ahead and check this link periodically to make sure you have the correct driver for your system. VIDEO DRIVER
Remember that the manufacture driver always trumps the video card driver. So fill in the boxes and get the one for your machine.
Computer Aided Technology