What is your system info?
Operating system, DirectX, Video card, and the resolution you are trying to run it at and how many monitors you have.
Also if you can run the DXDiag and send me the log result after you tested the Display drivers.
A screenshot of the Settings panel would help also in case the anamorphic factor got changed to a bad value. For a normal display, it should be 1.0.
Try running it in Window mode and tell me if that works.
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