I'm trying to view a ac3.xvid-fty.avi file and with Quicktime and DivX I did not get audio. I installed the Quicktime ac3 codec for the sound and not only does the audio not work but both times I tried to play the file, the computer crashed. What do I do? Should I use another media player or another plug-in? Please help because I have a lot of avi files I would like to watch.