I've tried upgrading, reinstalling the following Bluetooth / wireless drivers :-
1> Dell wireless 1703 802.11b/g/n (2.4GHZ) - version 10.0.0.263
2> Bluetooth Device (RFCOMM Protocol TDI) - version 6.3.9600.16401
3> Bluetooth Device (Personal Area Network) - version 6.3.9600.16384
Updating drivers gave me a button for "on & off" for bluetooth device, which was not there previously. But it didn't solved my problem. I'm still facing connectivity issues. I've tried using my two smartphones (both Sony Xperia - E and tipo) and a laptop (Acer Aspire 4736Z). My Dell is not receiving any files from any device. It only shows a progress bar below the name of the discovered device, but it stops in between and won't go further.