I have the same problem. A recent WIndows 10 update did this. I have reinstalled the IDT Audio Driver. It works properly for about 30 minutes and then teh light stays lit no matter which state the button is in. It does mute and unmute properly but the light gives the wrong indication in the ummuted state. I even tried a Windows 7 driver I had stashed away with the same results. I have the ENVY 17T (J-100).