Welcome to the forum.
First, AVI is but a wrapper, and can contain various CODEC's, some that PrE cannot handle, and some that require a download and installation, to use.
If you will run one of your AVI files through G-Spot, or MediaInfo, and tell us the full details, including the CODEC inside the AVI wrapper, someone can direct how best to get the Video - PrE is not seeing that, and only the Audio.
Good luck, and please let us know more.
Hi Bill, could you send me a link to G-spot or Mediainfo, I suppose I need to down load software? again, IWISHIWASBETTER