Cant use single GTX 780. Can only use in SLI.

Hey everybody call me bonester and I'm new here. Well I picked up a sweet Aurora r4 Alx with the 4390k and 2x gtx 780 in SLI config.. Works great but I removed one of the 780s to put in another system and started back up the aurora and when I go into windows and try to play warzone i get an error " The game couldn't start b/c your Graphics Processing Unit (GPU) Microsoft Basic Render Driver is not supported. .
Whats weird is that the Nvidia control panel is gone . Ii right click amd its not there. Any clues.