|Strange intermittent symptoms - could be record socket or other hardware issue.|
Just to start this post rolling:
I see you have a question mark against a "USB Device". Can't see how this could affect sound but you might as well Uninstall it from Device Manager then reboot. This will reload the software and might get rid of the USB error.
If you look in your AV logs can you find what "volume" file was removed?
Type sfc /scannow in the Run box (note the one space) then hit Enter key. Let it run and it should put back any missing system files.
About the only other thing I can think of is to look inside the PC (I'm assuming it's not a laptop) and make sure all connections in the sound area are firmly placed. If it is an add-on sound card, clean its edge connectors with a pencil eraser then pop the card in and out a few times to remove any oxide from the socket.
Always pop back and let us know the outcome - thanks