SwitchAudio
Switch through default audio playback device for windows by a single click
Based on AudioEndPointController by Dave: http://www.daveamenta.com/2011-05/programmatically-or-command-line-change-the-default-sound-playback-device-in-windows-7/
Place the files in a folder accessible without admin rights. Run SwitchAudio.exe and follow the instructions to configure. Once the configuration has been created, run SwitchAudio.exe to switch between the different audio outputs
Run "SwitchAudio.exe -setup" and follow instructions