WoW OK? A 8800GTS Without PhysX??
Your drivers aren't the newest but they definetly include PhysX. Actually all of the options are supposed to be there, All Nvidia 8series GPU's with 32Cores should have all of them. My SLi GTS250's have all.
Also I checked a 6800GT with the SAME Drivers and it doesn't have physx....
That's rather strange, I would have thought that CUDA support implied physX support. It's possible that in this case it's some non-CUDA option that uses pixel shaders to do the computations? Never heard of this being the case for PhysX though...
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