I got mine at nvidia.com. I googled to find Nvidia system tools and system monitor (also an Nvidia product (no cost, not certain of the name). Make sure that you get the most recent version of system tools, but also make sure that your system tools don't pre-date the driver you wind up choosing.
One more point, I'm not sure as to the state of driver choice for 9600m on a mbp. I used an updated Nvidia driver, but many ppl may use modded drivers from laptopVideo2go or elsewhere.