resolution stuck! please help!

[Elfgrim]

Hi. I installed the game and tried to change the resolution to find one that works best with my widescreen monitor. I accidentaly changed it to a resolution that my monitor doesnt support and now every time i start the game it says "VIDEO MODE NOT SUPPORTED". I reinstalled the game and also edited the game config text but it sill says video mode not suppoted. I dont know what else to do. please help.