Game for DirectX 9 not working with DirectX 11

DirectX installs can co-exist. So it should be safe to install dx9 when dx11 is already installed.

You could also download a dll-pack, which might include the one you're missing. Download here

• Orcs Must Die totally supports DirectX 11. Gamers have confirmed it working: Read More Here

• Its your DirectX that is malfunctioning due to some reason. Microsoft has also logged it. Follow the instructions Here to fix it.

• Check if your nVidia driver is over-riding any DirectX settings.

• Test your system if the game can actually run and ur system can handle it Here