I know this might be no help but, do you know the return to windows sound trick?
Hazed showed me this a year ago, I had same problem, it was a standard bug, this is what i did,(and still have to do nightly).
Go to sound and audio devices properties, (or just right click speaker in tray then chose adjust audio ) then click on audio tab.
Then chose sound recording volume, in next window chose advanced, the last window will be advanced controls for microphone , make sure the 20db box is selected, if it is, uncheck it then reselect it, and your done, exit all them stupid boxes and go shoot someone down.....
Not me tho.
Good luck
Bumba