Windows Movie Maker and audio dropouts

I've noticed that some of the video projects I have created with Windows Movie Maker contain dropouts in the audio track. I first noticed this on the DVD's I created in March. At the time, I thought that the reason I was getting those dropouts was because my computer was low on memory so that WMM lacked the resources to render the video file properly. I suspected also that my hard drive was filling up so that there might not have been enough hard drive space for the temporary files.

Since then I have added memory to my computer and I have cleared off some of the large AVI files that were chewing up space on my hard drive. Then I rebuilt the afflicted videos - and found that they still contained audio dropouts. Thus I concluded that lack of resources was not the cause.

I verified that the audio glitches did not originate in the source files I was using. There were no glitches when I previewed my project within WMM. However, when I created an AVI file from my project, I found that the resulting file again contained the glitches. So I have concluded that WMM has some problems with the audio when it creates an AVI file.