Each media player has its own patenant codec. You need to download the divx
player at
www.divx.com. Avi files is a divx codec. Once you download the
player, all the codecs for avi files will be in your computer. Then if you
want to still use the media player to watch avi files, go into options, file
types then check the avi box. I suggest using I-tunes for any audio you will
play. While you are in "file types" in the media player. Uncheck any box
that is not a windows player file, (it will tell you in the description of
that particular file). Mpg or mpeg is a real player file. Any of those file
types, uncheck and let real player be the default for those filese. wmv and
wav files are for the media player. default those to the media player. I
suggest - Uncheck Avi files in any player you have except the divx player.
Let divx be the default for avi. Divx has much better sound and video than
any other player and its free, and it is a microsoft product so it is safe.
Quicktime is an apple product and can be useless in a pc. Unfortunatly, you
need it if you have Itunes. i hope this helped.