Can't get sound to play back on Movie Maker when recording with internal webcam/microphone

I have a Windows 8, 64-bit  Envy notebook.   I tried using Google Hangouts but there wasn't any sound (the camera was fine).   

Later, I decided to test the  internal microphone myself by  creating a Movie Maker file,  and clicking on Webcam and making a recording.  The camera worked but it played back in total silence. 

I checked the settings for the microphone and the internal mic was properly set as the default.  I turned up the volume to the maximum.   Then I found directions for doing a sound check, and I was able to do the Sound Recording check and get audio when I played the file back.   

But when I tried again to make a video,  i got zero in the playback. 

Any idea what's going wrong? 

Thanks,

Pat