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Make sure your 'Stereo Mix' is enabled in Sound - Recording also.

You can set to make it run minimised as well as run as administrator, although I'm not sure that is required. Create a shortcut and place it in your 'Startup' folder for either your account or 'all users'. Save as something like 'ToggleDefaultMic.bat' and put it somewhere you aren't going to lose/delete it. Nircmd.exe cmdwait 1000 setdefaultsounddevice "Microphone" 2
