There are quite a few config files, I am thinking that as you are launching the game for the first time that you have had a bad install, have you tried verifying the files as this would be the first port of call for me.
I have uploaded a screenshot of where you need to do this, just incase you have never had to do this before.
This menu is brought up by left clicking the Conan game in your library, then selecting installed files from the menu, then select verify integrity of game files.