I have previously used Audacity to record my audio, and recorded video using FRAPS. I use them both for movie maker. I have tried recording my audio with Audacity, but I can't seem to export it as a .wav file so that I can use it in movie maker.

Side note:
I do my recording for youtube videos, gaming videos. The last time I recorded it was about a month or so ago, and I was able to export the audio file as .wav and place it into movie maker. I made a recording earlier today, and when I went to export it I wasn't able to export as .wav. I'd use the FRAPS audio...but I'm really disappointed with it. It doesn't pick up sound all that well. To be more specific on the sound, I mean by using an xbox 360 mic to record voice audio. Audacity does a better job of picking that sound up.