1. Update your drivers (especially video card drivers) - you can use Driver Booster from IOBit -
2. Go to My Documents \ Cross Fire - select all files with .dat extension and delete = will reset all your game preferences to default
3. Look on your display settings and note your desktop rezolution
4. Start game as administrator and compatibility mode win7 - go to game settings and set SAME rezolution as your desktop under windows, and full screen mode
5. Join a room see if works. (I hope it will )