HELP !!!!!!!

I need help im combat arms just got a new computer and I installed combat arms the problem is that my startup screen is smaller than usual I tried the options thing resolutions wich only make the screen bigger when I play not when im in lobby anyone know how to fix it I did it with my old computer but forgot how to do it I would post pics but since its win 8 im kinda nub to use it

I think you have to change the resolution of your actual computer screen. thats what i have to do when i play because its streched out. hope i helped