Asus G73jh change active video card?

so im having troubl ewith my video card. i tried to update it using catalyst control center, and now my computer is running the VgaSave card instead of my ATI Mobility Radon HD 5870 Grahpics. this is making my screen res go down from like 1600x900 to like 1250 or something. its also causing my computer to over heat. is there a way to go in and manually swich it back to my good card?|||uninstall the card that you do not want to use and install the card that you want to use.