The community is also a great place to check out. Try these places for help from other users:
If you're encountering issues when launching or playing Call of Juarez Gunslinger, make sure everything installed correctly.
Exit Steam entirely.
Browse to your Call of Juarez Gunslinger installation folder (Usually C:\Program Files\Steam\steamapps\common\coj gunslinger\)
Run the following installers:
Reboot your computer and test the issue again. If the issue persists, contact Call of Juarez Gunslinger support.
If the above does not resolve the issue and you are running Windows 7, Windows 8, or Windows Vista, please complete the instructions in our Windows 7, Windows 8, and Vista Troubleshooting FAQ.
If you are running in Windows XP, take the following steps: