Turn on your device and make it discoverable. Select the Start Start icon button, then select Settings > Devices > Bluetooth. Turn on Bluetooth > select the device > Pair. Follow any more instructions if they appear. once this part is ok...
a couple of steps are
Run Windows Update....
set up System Protection (formerly System Restore) as its turned off by default in Windows 10.
check the Action Centre out for any notifications about application or driver updates here.
visit the manufacturer of the machine online and check the support downloads section
be sure your Bluetooth adapter have "A2DP" audio streaming feature. and be sure you setup the drivers fully
http://betanews.com/2015/08/02/sound-problems-in-windows-10-here-are-some-workarounds/