Adobe Audition help
 

Hey guys I need some help.
This question is for those who are familiar with Audition:

I'm used to extracting music from movies by using the "Open Audio from Video" function (both AVI and MPG files). Today when I tried an AVI-file, I got this message:

http://img335.imageshack.us/img335/4061/erroryi2.jpg


Why am I getting this message? I can't remember removing any codec...
Should I just re-install Audition...?

(I tried other AVI-files too and got the same message. MPG-files works)