The Dxdiag doesn't help regarding these type of Steam issues. That's a generic Steam issue and as far as I know it can happen with any game on Steam. I can offer an extra suggestion, verify if your Steam client is updated. My humble apologies - I won't bore you with the details of what led me to ru...

What possible reason could there be that this is the only game affected by this 'steam error'? I'm familiar with the generic solutions offered in your link. The only one which (in my opinion) could possibly be applicable is "Solution 3: Installing DirectX and Microsoft Visual C++ Redistributabl...

DxDiag file attached.

The game is in my Steam library. Integrity of game files has been verified. I get the error 51 message as soon as I click start.

Hope you can help - let me know if you need any further info.