This happened to my Windows 7 corporate build just this week. It has been a Logitech USB Headset for years, and suddenly WIndows calls it a "Lync Audio Device"? WTH? I don't use Lync!!!! And making a new name for lack of sound might as well call it a "Silent useless Audio Device". No need to make Lync the scapegoat for "Silent Useless" product updates for Windows. That is entirely on the Windows team.
Give me back my headset. I think I was robbed in the middle of the night.