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I guess the method nvidia uses to detect if an AMD GPU is installed on the same system is very rudimentary. Even if just parts of the AMD driver are installed, nvidia takes its CUDA ball and goes home, play time over. 
I may have installed an AMD SDK on this system (laptop, no AMD hardware in it at all) in the past and some files were left over on the laptop after the SDK was removed. I fixed it with the TwL cleaner, but this is still really lame. If you're going to be such a big baby about keeping PhysX off AMD systems, at least make sure the detection works nvidia.
(I understand if it "should have worked", but obviously it didn't until i killed traces of whatever parts of the AMD driver was installed with the SDK.)
I may have installed an AMD SDK on this system (laptop, no AMD hardware in it at all) in the past and some files were left over on the laptop after the SDK was removed. I fixed it with the TwL cleaner, but this is still really lame. If you're going to be such a big baby about keeping PhysX off AMD systems, at least make sure the detection works nvidia.
(I understand if it "should have worked", but obviously it didn't until i killed traces of whatever parts of the AMD driver was installed with the SDK.)