First all, we dont know what Os are you running
But here is the process to what to do :
- uninstall your nVidia graphics driver, it will command you Restart probably but dont do that, click Restart later and shut down your PC normally.
- Open your PC unplug your card and plug in again, sometimes is not correctly plugged.
- Start your PC and install the last graphics driver package, download the correct driver for your Os and card from here :
http://www.nvidia.com/Download/index.aspx?lang=en-us
- Restart your PC even if the driver installation dont command you to do that.
Time to start the game :
- Disable Steam Cloud in steam configuration.
- Go to your ...
\Documents\1C SoftClub\il-2 sturmovik cliffs of dover and remove the conf.ini to your desktop, to backup it, then go to
cache/shaders and delete all files.
- Start the game, it will create a new conf.ini in the process, and new shader files in the first loaded map.
If the problem persist open the new conf.ini to be sure that is using DX10.