Please ensure that your graphics card does in fact support DirectX11. You can check this by running the DxDiag application. Instructions on how to do this: 1) Go to your start menu 2) In the search box type in dxdiag 3) hit enter.  In the DxDiag window, you will see a field called DirectX Version. It will likely say DirectX 11. This means that the software is installed but not necessarily that your graphics card actually supports DirectX11. Select the Display 1 tab and look for the field DDI Version. It needs to say 11. If it says 10 or 10.1 then you graphics card does not support DirectX11.