Crossfire Settings Problem

I haven't played the game for a couple of months and recently I tried to play again and on the load up screen it came up with the fullscreen mode when I had it on windowed mode. So I logged in and changed settings to windowed mode again. Hit save. The saved successfully message came up. And nothing the screen didn't change but all values you can change (E.G. Sound, Gamma Settings) all went to zero and when I tried to change it all back to normal it doesn't save. If I quit and re-login the settings go back to normal but the screen stays the same. Also if I hit save name on login screen it doesn't save. If I go into settings and a change a value the same stuff happens. I've re-installed the game several times, scanned my pc etc.

Any help would be greatly appreciated.

Sorry for the long paragraph, never seen this problem before..