After following the steps of Bruno Pereira's answer in "NVIDIA Quadro NVS 160M in the Dell Latitude E6500". My NVIDIA Quadro NVS 160M driver installed on my system without any error, but after rebooting my system when I go to my system info -> graphics, driver still is "Unknown".
My display is good in resolution 1920*1200(16:10) but graphical objects are very small and when I change the resolution, my display goes opaque. I don't know what should I do!