XvID installed and now no sound

I am trying to play a movie that is a .avi file with QT. It said i needed to download and install XvID to play it. so I did, and now the movie plays but theres no sound. I have no idea how to fix it. I went to the A/V controls and the volume is all the way up. That's all I can figure out to do. How can I fix this? I definitely not very mac savvy so if you can answer, please dumb it down for me. Thanks.

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