Hi Surabh
I have exactly the same issue as above. I have a Dell Latitude E6320. I have tried to install several different bluetooth drivers (on Windows 8) none will communicate with my bluetooth radios (I keep getting a message to turn on the bluetooth switch even though it is already on). I have confirmed that Bluetooth is switched in in my BIOS.
In case you need it my Service Tag is: <ADMIN NOTE: Service tag removed per privacy policy>
I originally had the machine on Windows 7, I upgraded to Windows 8 about 2 months ago and all is well EXCEPT my Bluetooth drivers. Please please tell me you have an answer!
Jason