The community is also a great place to check out. Try these places for help from other users:
Please review the Third-Party Game Support topic to determine whether your question should be directed to the game developer or to Steam Support. Sending a support request to the wrong party may result in a delay in processing your request.
If you're encountering issues when launching or playing Dark Messiah of Might and Magic, make sure everything installed correctly.
Start by checking your connection with Steam and then try verifying your game cache. Reboot your computer and test the issue again. If the issue persists, contact Dark Messiah of Might and Magic support.
If you did not install Dark Messiah to your Steam folder and would like to move the files:
If you consistently receive an Invalid CD Key error when trying to register Dark Messiah of Might & Magic, try re-entering the CD Key backwards, digit for digit. If you continue to have difficulty, please contact Steam Support.