Video Files not working on some players (and avi files)

[notme]

VLC only play sounds when I open video files.
Movie player only runs mpg files, avi only sounds
Kaffeine is working great

Im using Gnome in a Compaq Evo N610c

Last thing I did, someone asked my if livna was installed, and It was. I tryed to uninstall it and re install it, but after I did the first step, I couldn't find the file rpmfusion-free-realease-11-1 (noarch) anywhere.
Now livna is unistalled

Yet the problem persists, so that wasn't the problem.
I don't know what is that rpm about, but Fedora is working ok.

What should I do about both things? (Video Files and livna)?

[notme]

Update: Youtube sounds n ot working either
(firefox)