Wireless Network interface has stoped functioning and the BIOS does not recognize the existan ce of the WiLAN interface

The motherboard could have over-heated which can damage the wireless board. Some laptops have problems with this, and the only way to fix it is replacing the motherbaord. Contact the store you bought the laptop from, or ring the make of your laptop. They will be able to tell you if it is a common fault, or what they can do for you. It will be covered in the manufacturers warranty.

Or there might be a possibility it was deleted from the computer, or the drivers have been removed, but it most likely the hardware, not the software.

The interface is failed or there may be some virus in your system. Use a good antivirus or re-install the windows. Please rate this!!