How to find and install advanced dolby driver?

My laptop is lenovo g780, just upgraded to 8.1, where do I find the advanced dolby driver and install it?
comments please, didn't find lenovo website very helpful.
mike

The same thing happen to me with the G580, make sure the dolby is not deactivited left click on the volume thing and click playback device or something at least it's after the voulum mixer. And left click dolby and click activate if that dosen't work update the drivers- the lenovov support site is very helpfull: http://support.lenovo.com/...D=DS028123
there's all audio drivers for your model