Have been to the manufacturer site for installed chipset, ATI.
Device driver identifies it as an ATI Integrated Digital Audio Driver date; 09/13/06 version 6.1.4242.1 not digitally signed.
Under driver files however there shows a certificate icon and C:\Windows\sys32\drivers\ktshunk.sys after that.
Info box shows Provider Microsoft Corportation.
File version 6.1.7600 16385 (win 7_rtm 090713-1255 Copyright Microsoft Corporation All rights reserved. Digital Signer Microsoft Windows
This is all on an HP dv5000 that was running Windows XP but is now running Windows 7. If anyone knows the right driver please tell me.