- go to
ftp://ftp.asus.com/pub/ASUS/mb/Driver/Audio/ ;
- select your audio device "ADI" (for your motherboard);
- download
AD1988_Vista_61016110.zip (it is driver for the Vista audio card , which should work.
- unzip it it to a suitable place on your hard drive.
- open "Device Manager" window;
- right-click on your sound card and "update driver"
- in the next window select "Browse my computer"
- select the path where you unzipped the driver
When it has finished (hopefully) restart the computer. (This may not always be needed)