Why ask if he said what solved the problem?
That sounds like it might be the solution, but unfortunately I do not have any such option as I have the Intel Chipset with the Nvidia GPU. It could also be that I have failed to figure out how to do what you explained, as your directions are somewhat unclear.
I do have a Nvidia control panel obviously, but I can't seem to figure out how to do this. Could you perhaps give some more details? It would be very helpful, and might be something for the FAQ.
Here is a picture. It's in norwegian but it will give you a sense of what you are looking for.
Like me and like 99% of the world.
I must select GPU for PhysX?