Acer Extensa 4630z laptop sound/audio driver problem on Windows 7 ultimate 32 bit

[WizIT]

My Acer Extensa 4630z laptop sound/audio driver on Windows 7 Ultimate 32 bit not working. It was working few days before but stopped suddenly. I tried all the audio driver from http://us.acer.com/ac/en/US/content/drivers. By the way there is no audio driver for Windows 7 so I even tried Vista audio driver from same site but no luck. I tried Driver Pack solution 14 but it could not detect audio. I even installed new Windows 7 ultimate 32 bit but no luck it found automatically many drivers but not audio. Please help me figure out audio problem. I tried installing Realtek driver for Vista and Windows 7, no luck either. thanks
Device Manager Screenshot

 

[Alabalcho]

Start with figuring out what these "Base Device" with missing drivers are.
As a last resort - get $10 USB sound card known to work with your Windows.