OK, I don't recommend this for most people but I cannot find the right driver.
What you might try is a product called DeviceDoctor.
READ THIS FIRST: DeviceDoctor is not perfect and actually messed up my system so it took me 45min-hour to recover in safe mode. It worked for 2 drivers but then the third driver messed up my machine. One of the drivers that did work was Audio, so what I recommend is that you first create a Restore Point on your computer. Then install and run DeviceDoctor ONLY to update your SOUND driver; do not allow it to download/install other drivers. Then reboot and make sure everything works. If there is a problem then use the restore point to recover.
DeviceDoctor
Also be careful when installing - it adds a toolbar by default and most people do not want it so be sure to uncheck that.