No sound on my G580 Notebook after upgrading to win 8.1

SInce upgrading to Win 8.1 on my 64bit Lenovo G580 notebook I kept receiving a message about Dolby driver problems (my sound did work though).  Then I thought I would get rid of this message - update Dolby drivers - and followed advice on the internet.  As I remember, this advice told me to uninstall all sound / dolby drivers and then install new drivers.
In doing this I somehow also uninstalled Dolby PCEE4 drivers for my G580.
I subsequently installed the latest G580 conexant drivers but with no success.  I can "see" that the drivers are working (when I click on the sound icon bottom right of the desktop), but there is no sound.  Other internet advice has been to obtain PCEE4 drivers - but I don't find any files from Lenovo to download.
I've tried to reload Dolby Advanced Audio V2, but it ends prematurely with the prior message that PCEE needs to be installed.
Can someone please assist?

http://support.lenovo.com/gb/en/products/laptops-and-netbooks/lenovo-g-series-laptops/lenovo-g580-no...
are you sure its not the realtek drivers as some have said its in there
Thx dave
yoga 2, lenovo b540
3 custom gaming pc systems

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