Tim,
This is a difficult one.
The way I see it is that you currently have two graphics cards running a left and right image each onto two projectors which, I assume, you overlay with eachother to create one 3D image (very inventive BTW

).
If you are running this from your laptop you may need to purchase something like a 3D HDMi device/peripheral OR if you are running from a PC then I suggest looking at:
http://www.nvidia.com/object/3D_Visi...uirements.html to purchase the right graphics card for the job.
I hope this helps in some way.
Regards
Karim