starcraft resolution problem

im playing starcraft on windows xp SP2 and the screen is WAY to big. i cant change the resolution in game, when i change my desktop resolution it still doesnt help. it says to change it to 640xsomething (cant remember right now) and i dont have that option. is there any other way i can change my resolution to make it fit my screen?

i also tried the differet compatibility modes and it didnt work. it said to put my cd in, which i did, and it still says its not in there...O.O