Can not play avi files; please help!!

i have a imac with Mac OS X 10.4.11; i can't get sound on any avi files, if take a mov file and convert it to avi, no sound; a friend give a disc with several avi movies, but i dont hear anything.
can anybody help me please

Download and install Perian from http://perian.org/
You should read this support page http://perian.org/#support in case you need to delete older codecs.
In Macintosh HD/Library/Quicktime/ delete any files relating to DivX (Perian already has them). However it should be noted that Perian is not an internet plugin and will not play DivX files imbedded on a website. For that you will need the DivX Player browser plugin available from http://www.divx.com/divx/mac/

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