Solutions:
Enable the Bluetooth feature in the Setup Utility program.
Right-click the Start button to open the Start context menu.
Click Device Manager. Type the administrator password or provide confirmation if prompted.
Expand Bluetooth to display the Bluetooth devices. Then, right-click each Bluetooth device and then Click Enable device.
Expand Network adapters. Then, right-click each Bluetooth device and then Click Enable device.
Click the Start button to open the Start menu.
Click
.Turn on the Bluetooth switch to enable the Bluetooth feature.
Update or reinstall the Bluetooth driver. See Keeping your computer current.
Solution:
Exit the application that uses the sound device (for example, Windows Media Player).
Right-click the volume icon in the Windows notification area on the taskbar.
Click Playback devices.
If you are using the Headset profile, select Bluetooth Hands-free Audio, and then click Set Default. If you are using the AV profile, select Stereo Audio, and then click Set Default.
Click OK.