Sound problem
I had the same problem, I found the following solution at (snip: removed link - it just sells an affiliate product.).
Find the latest version of your driver, download it, uninstall your current driver and install the new one. 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.
Hope it helps if it doesn't they have other suggestions.