Need to change resolution without launching games
I bought a new monitor, but I can't play my games since they were set to the resolution of my last one, which was 600x800 I think. The new one is 1600x900. It wasn't a problem for World of Warcraft since that launched anyway, but the others I want to play, COD4, Company of Heroes, and Sins, won't launch at all, which stinks, since I need to get them to launch in order to change the resolution.
Will someone tell me how I go about doing this?