First off I would get rid of WMP. It's nothing but trouble. Try VLC media player. It's free and has codecs built in. I don't use it but is highly recommended on this forum. I understand it will play vid & aud. Make it your default player. As far as burning an AVI file goes you will have to convert the avi to dvd. If you want to spend a little money which is well worth it check this out AVS Video Tools, Video Converter, Audio Tools, Video Editor, DVD Player, DVD Copy, TV Box.. It will do just about everything you'll need. I have it and would'nt use anything else. Hope this helps