Please ensure that you are not running the game with any 3rd party overlays (such as Teamspeak).
Update to the latest version of your graphics card manufacturers drivers
If you get a "Negative Delta Time" error, please try installing Steam\steamapps\common\Ravaged\Redist\UE3Redist.exe
Try run Ravaged from the command prompt with the following command line "ravagedgame.exe -compatscale=1 -windowed - regenerateinis". This will start Ravaged in a fairly safe mode, please be aware that it will erase your current Ravaged settings.