Windows 7: NVIDIA nForce Networking Controller has driver problem

I have HP pavilion dv6500 laptop, recently I noticed that my wireless connection is disappeared. Now I can not access internet at all. After troubleshoot checking I got a message that Nvidia nforce networking controller has driver problem. I have installed nvidia nforce network controller driver from internet. Even I have reinsalled window 7 to my laptop but still this driver shows missing.
This problem arose when my laptop battery runs out and as soon as i restarted my laptop with charger this wireless connection got missing. Any help will be appreciated.

You might want to try the HP WLAN trouble shooter for this problem.

Solve Setup and Internet Connection Issues on a Wireless Network with Windows 7 HP Pavilion dv6500 CTO Entertainment Notebook PC - HP technical support (United Kingdom - English)