After installing Audacity 2.0.5 on a Windows 7 64-bit machine, I cannot get sound from other applications such as YouTube, CD Architect, system sounds, Windows Media Player and other applications. When I use Audacity, I get sound. This is extremely frustrating. Please help.
If you are using a USB recording device, see here: http://manual.audacityteam.org/o/man/faq_playback.html#usb