Sound only with Audacity, no sound with other programs

Sound only heard with Audacity, no sound with other programs. Can see the volume meter playing on Realplayer, etc, but no sound [attempting to play the same files]. Same results with both mp3 and wave files. No sound on quicktime, or windows media player or windows music either.

Tried uninstalling realplayer and audacity and then reinstalled. Do not remember when this started. So do not know if this is related to a windows update, or after a program installation.

Windows 8. Audacity from exe file version 2.0.5 Thanks.

If you are using a USB recording device like a USB turntable or microphone, disconnect it or set Windows to use your built-in sound device as default playback device. Please see: (follow the instructions there for Windows Vista and 7).