well i have tempered withe resolution settings and the game crashed and now i am not able to play the game again

when ever i click on the multiplayer of single player icon i keep getting the ignore report and relaunch dialog box

i tried reinstalling fresh but nothing works

it used to run smoothly before i thought of changing the resolution which was set to 640 by 480

since i just moved onto mac i dont know the temp files where the settings are stored so if any one can guide me i can delete them coz i think that is te reason or can u tell me what things i need to edit in the config aka .cfg file i could do that as well

cheers plz help me