Issues with Settings

Hey, so I've tried playing Crossfire today and for some reasons when the game is running the screen was completely dark, I tried changing my settings to window menu mode and raising the gamma from zero and saved the settings, but for some reason the settings wont save and when I check again, the screen is still pitch black, and in full screen mode? can someone please help me, I really want to play but I can't play with this issue.

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