A friend have burned some movies on a cd for me,BUT,he is (off course:mad

on a Windows puter.If I put the cd in my imac 400,I get the message,disk not found.They are in avi format,and she used DIVX 3/4 as codec?? (I really don't know **** about movie codecs)
What do I need to plat them on my Mac?If it is possible at all??