Whenever I try to change the game settings in the general tab of the Config it always crashes when i click save no mater what I do. So now i cant fix my fps lag or change it to windowed so my graphics card doesn't mess up (when i run some games in full screen my screen just goes blank and says no input so i have to restart my computer).
I made a video to show what problems I'm getting:
http://www.youtube.com/watch?v=V-uQhVU4Y4s

Any ideas?