I have an .avi file that plays perfectly fine in Win Media Player but when I import into MEP 13 there is a buzzing in the audio and the rest of the audio sounds corrupted. The video plays fine.
We need more information about you computer spec and the video files themselves.
AVI is not a video format - it is a container file which can contain any video and audio codecs. Use GSpot to analyse a video file and come back with the results