@ SpoiledBarbz ,
I saw your post in the other thread since the problem is the same I decided to post in the new one you started .
To start with I've used windows movie maker very little so I'm not sure what type files it creates or which Audio codec it uses.
It may be that DVDFlick has a problem with the Audio codec windows movie maker uses.
Can you play the A/V files you create with windows movie maker with a media player like VLC ?
Those would be the files before using DVDFlick.
If you don't need to convert the files to DVD compliant format you can burn with ImgBurn instead . DVDFlick itself is not a burner it uses ImgBurn to do its burns. So unless you need conversion DVDFlick isn't needed.
For needing a dual core or even more CPU . These handle conversion faster but my old backup computer has an old single core & DVDFlick works with it . It is just very slow.
So first try the files from windows movie maker in VLC on your computer & see how they sound. If they sound good then we know the problem is later in the process.