I unistalled my onboard graphics to force use on new GPU, now i need them!!

Please help me, my GTX 690 graphics card is faulty and needs to go back for a service, part of trying to get it to work properly involved me uninstalling the onboard graphics altogether, it was the only way to force the pc to use the GTX 690. Now i need my onboard graphics back but when i went to the motherboards site and downloaded a driver my pc says it cant use it. I have a Maximus V Formula (ASUS/ROG) motherboard. It will not auto-dect them when i scan for changes and when i install legacy hardware it doesnt work.