What program do I need to watch .avi video files?

[The One]

Any help would be great.

[The One]

More specifically I can hear the file, and the screne displays everything like it's a music file...how can I alter it so I can see the picture?

[The Fugitive]

That sounds like an codec problem to me.

http://www.cdr-zone.com/software/codecs/ace_mega_codecs_pack.html

Install that program, it contains dozens of codecs, I'm sure one of them will make your 'music' file turn into into a video file.

[samichna]

www.divx.com

[samichna]

And yeah, it is definitely a codec problem.

[egoslam]

And yeah, it is definitely a codec problem.
And as Samichna offered, I guarantee that it is the Divx codec that you need.

[sadio8]

VLC Player - www.videolan.org great player that plays all video files :)

[el fregadero]

Just stop downloading porn unless it's mpeg or wmv.