Windows 7 Nvidia Physx Problems

[Ghost-pc1]

I rarely ever talk on forums but I have been stumped. I am new to Windows 7 and I thought maybe it
was allot like Ultimate x64 but I guess I was wrong.

So here is my prob, I have 8800gts and 8600gt. Now I know I don't need to but I want to put all
the Physx on the 8600gt. For so reason Windows 7 wont let me nor let me even enable Physx.

Please help and any feed back is welcome. (even if it's to call me retarded Lawlz!!)