Add this lines to your repositories
Code:
############
###Codecs###
############
#deb http://www.debian-multimedia.org/ sarge main
#deb http://www.debian-multimedia.org/ etch main
#deb http://www.debian-multimedia.org/ sid main
Uncomment the line for your distribution and run:
Code:
aptitude install w32codecs
Very Important: After the installation is complete you should comment again the line