Problems with the sound of some .avi files

Hy, i’ve tried in Windows Media Player, in BS player, Blaze DVD and Nero, and some of my .avi files don’t make any sound. For example, i’ve download all season of smallville from here:
http://www.google.com?t=907804&highlight=

The season 5 works fine, for example, and the season 1 doesn’t make any sond. Even more strange is season 2, where all files work fine, except episode 2, that doesn’t make any sound too…
Do I need any drivers? Thks
Answer #1
i presume you have installed codecs?
for example the k-lite pack ?

http://www.free-codecs.com/download/K_lite_codec_pack.htm
Answer #2
After i install this codecs, when i burn the movies into a DVD in .avi, will they play in a normal DVD player ?
Answer #3
After i install this codecs, when i burn the movies into a DVD in .avi, will they play in a normal DVD player ?
Yep, but it needs conversion, use ConvertXtoDVD
Answer #4
Try VLC player if you want to watch on your PC, it supports most files