please help me with crosshair problem

problem: i recently got put into a mod lobby in which all that happens is you spawn and get headshottedby host (no killcam) all i see in killfeed is host getting headshots and he has about 3000kills just as i joined so i decided to leave this server but this mod apparently disables the "esc" button so i had to open task manager in order to close mw2 then when i opened mw2 again it the resolution was reset to 640x480 so i put back normal settings then i joined a game and the whole view was f'ed and it looked liuke it was 3D and the radar on the top left was taking up a 4th of the screen and the crosshairs had dissapear and on top left of screen there is now numbers which change each time i move so i'm guessing they are co-ordinates of where i am on the map. an hour ago i tried to turn my crosshairs by on by going into the config.cfg and when i joined a game to see if it worked it just had black screen so i put the crosshar back to "0". can anyone tell me how i can fix this?