RE: DELL INSPIRON N5110 15 BLUETOOTH IS NOT WORKING IN WINDOWS 8.1 x64
The Inspiron N 5110 is not tested with Windows 8.1; hence there are no drivers available. However, you can try installing the wireless driver (windows 8) in the compatibility mode.
http://dell.to/19K2yHW 1701 wireless driver
http://dell.to/19K2yHW 1702 wireless driver
Choose the appropriate wireless driver for your system and install it, Follow the steps below to install in compatibility mode
Right Click the driver installation file and select Properties/Compatibility Tab > check the box run this program in compatibility mode, Select the appropriate options.