How to (if you want to use it instead of Realtek HD audio drivers):
1. Uninstall Realtek HD Audio drivers. Reboot.
2. Install "Dolby PCEE Drivers". During installation process, choose ever "DAA(release)" for Advanced Audio v2 OR "DHT(release)" for Home Theater v4.
3. Install ever "Dolby Advanced Audio v2" OR "Dolby Home Theater v4" depending on the chosen settings previously installed "Dolby PCEE Drivers". Reboot.
4. Enjoy.
How to (if you want to use it instead of NVIDIA|ATI HD audio drivers):
1. Uninstall NVIDIA or ATI HD Audio drivers. Reboot.
2. For Win 8, disable driver signing (tnx RagDoll_Effect for the tip )
3. Install "Dolby PCEE Drivers". During installation process, choose "DHT(release)" for Home Theater v4.
4. Install "Dolby Home Theater v4". Reboot.
5. Enjoy.
[youtube]http://www.youtube.com/watch?v=cr9o5Ihidio[/youtube]