I have and HP Envy I7 which came with Windows 8.0. I upgraded to Windows 8.1 through the MS Store. I have a Samsung Galaxy S4 that I tried to connect via Bluetooth. Every time I try to pair them, the computer says "Connected". But in about 10 seconds it changes to "Not Connected" by itself. The Bluetooth Driver is Intel Centrino Wireless Bluetooth 4.0 High Speed Adapter version 3.1.1311.400 dated 10/18/2013.
Nothing but the MS Windows Updates is on the machine. I can not keep the phone connected to the computer to do anything at all.