using 8600 GT as GPUPU only

Hi all,
I’ve have recently upgraded my PC with a new gfx card (hope you won’t be mad at me: AMD HD 3870 :whistling: ) and wanted to continue using my 8600 GT for CUDA and as PhysX Processor.
Unfortunatly Vista 64bit doesn’t want to load both drivers together so either the 8600 or the 3870 is disabled, depending on which card I connect the screen to.

Is there a way to get both cards running together?

EDIT: Sorry for the mistake in the headline. I meant GPGPU of course!

no, Vista can’t load drivers from multiple vendors.