Make sure your computer is connected to your HDTV via an HDMI cable before you begin these steps.
1. Right-Click on the Sound Icon located in the lower right corner of your desktop
(the icon looks like a small speaker).
2. Left-Click on Playback Devices from the menu:
3. Now the Sound Window will open, make sure the Playback tab is selected.
4. Right-Click on the HDMI Output playback device.
5. Left-Click on Enable from the drop-down menu.
That’s it, you should be enjoying HDMI audio from your computer to your TV.