Dual Monitor Issue

[HappyLttleMan]

I am trying to do a Dual Monitor multimedia show. I have two video cards on my computer, and I am trying to hook them both to video projectors, and play a file that is 1600 pixels X 600 pixels. Basically I am strecthing the file in borderless play over the two monitors. My issue is that when the window stretches across both screens, the video will only appear on the screen that has more of the window on it. If there is 3/4 of the playing window on the left monitor, I can see video there, and a black box the size and shape of the window on the right monitor. Same if reversed. The video will play on either monitor, just not both. Does anyone know of anything that could fix this problem?