Upgrading from Windows Vista to Windows 7 could sometimes result in WiFi not working. Hence, no Wifi networks will be detected.
Solution:
1) Download the latest driver for Wifi 4965AGN from the intel website [http://downloadmirror.intel.com/19855/eng/ICS_s32.exe]
2) Uninstall the existing driver.
3) Install the downloaded driver and test wifi. it will work.
