I'm using Dell Inspiron 3542 model and the operating system is Windows 8.1. I had uninstalled my wifi driver by mistake. The wifi symbol at the bottom right corner is replaced by ethernet connection symbol. But my bluetooth is working. I dowload the wireless lan driver (270 MB) file and when  i tried to install, it shows activate bluetooth using switch, i had pressed all the Function keys one by one...but it wont works..i had also tried system restore...it remains same...what should i do??is it possible to reinstall my wifi driver?? If so plzz give me the solution