You get this message when you try and run the driver installer?
There's one other thing you can try.. open device manager, select "update driver software" for the audio device.
select "browse my computer for driver software" and then "let me pick from a list of device drivers on my computer".
If there is a device listed as "High Definition Audio Device" install it, (ignoring any warnings about compatibility)
If not, uncheck the box that says "show compatible hardware, then find that device in the list.
Sure hope this helps!