could be missing some codecs. you can use several programs like GSpot to find out what codecs the AVI needs then just download them from a webiste like fourccc.org (if it is still running)

__________________
God's in his Heaven, All's right with the world
The bird of Hermes is my name, eating my wings to make me tame


Vi Veri Venivursum Vivus Vici - By the power of Truth I while living, Have Conquered the Universe
Peace shall be restored with this sword, the harmful shall be purified by our righteous methods, I am god’s messenger, and I’m the one who carries out Heaven’s punishments