i have been throug te article but non of them ring true
u c i was using bluetooth on my pc before it was being formated
my cousin was installing ubuntu linux in it
he just erased the computer fully nothing was left then i took the pc to a shop
ang got windows installed in it.but still i have missing drivers like -
BCM20702A0,
SM Bus Controller
Universal Serial Bus (USB) Controller
Universal Serial Bus (USB) Controller..
hope u got it