How do I download windows 7 driver for NVIDIA GeForce 8600M GS video card?

When I try to play a dvd it says I have to upgrade the driver for my video card. After putting info online it came up with this video card. I hope it's the one I have. But where do I find a download for my HP laptop? I did find the site Blitware but don't know if that's what I need. This laptop has been upgraded to Windows 7 recently and the crazy thing is I watched a dvd a few days ago with no problem. Now I cannot get it to run the dvd without upgrading a driver. Anyone understand what's up with this laptop? thanks|||http://www.nvidia.com/Download/index5.as…