Don't worry for that, I had the same problem as your and I found the solution.
Try to uninstall your current driver and install the last version of your driver. After uninstalling the driver and reboot it to automatically reinstall it, the audio still may not work. Amazingly though, sometimes after putting the system in hibernate mode and coming back, the audio worked.
If it doesn't work, go to noaudiooutput.com, they have many suggestions. I found my solution there.
Hope it helps