sorry i have important question my cores cuda not work on my gtx 760 please help my

hello to all,
I wanted to know what are your experiences with programs that use the CUDA cores of your cards nvidia geforce?
which video cards you use and what motherboard and cpu use?
I unfortunately can not run the CUDA cores of my geforce gtx 760 with the latest nvidia drivers and windows 8.1 operating system.
someone told me that might be the pci express bus
too slow for my motherboard Asus P5Q-pro with cpu intel quad core Q9550.
I’d like to know if you have a configuration similar to mine and that works.
I would like to use after effect cs6 power director 12 any video converter and make free video converter.
I am waiting for a welcome your feedback.
thank you very much.
mark