Quick note to say that it's a really good idea to ensure that your USB microphone is connected BEFORE you start up audio applications that will look for the mic as a source.
Of course your computer won't see the mic if it's not plugged in and some applications won't recognize it unless it's connected when the application is started.
You may need to restart applications to get them to "see" the mic, once you've plugged it in.
Forums: