No Wi-Fi Option in Windows 8

Hi,

I've created a dual boot system on my Dell Inspiron 15R (5520) in which the laptop came with pre-installed windows 7 OS. I later installed windows 8 OS along with Windows 7 for my work.

But I cannot see any Wi-Fi option in my settings charms bar. The only options available in the Change PC settings->wireless is Airplane mode(ON/OFF) and Bluetooth(On/OFF). Please help me out and please provide me with some solutions.

Thanks.