hmmm openGL settings?
i prefer to use Media P_layer_ Classic from K-Lite Codec Pack

anyway let's say You can do this:
1) close epiLight software and any other programs on Your Windows 7 that You are not using them at the moment
2) disable Aero from a Windows
3) be sure that You have already connected second monitor
4) run epiLight software
5) _turn _off_ Auto enable function in epiLight
5a) check if a second monitor is connected
5b) now try to Enable epiLight

tell me if in this point epiLight is working and if You will move some window on a second monitor it will works or not

6) start divx movie and move it on a second monitor
doest it works?

7) start hd movie on a second monitor... tell me exactly what happen