Why wont videos work?

Because you're an idiot.

...*Ahem*...Download and install this and try playing the video with this.
VLC Media Player

Don't help him.

Why are you saying vlc? Make him work.

Doesn't Sindalf always write, at the end of his posts, that you need to download CCCP to ensure any of the videos work? Or is OP just illiterate?

To be honest. I torrent some files from sub desu which never played either. K-lite also but with k-lite nothing would play. I can't remember the name but it started with a ambulance of some sort blazing all sirens.

Follow this guide and you'll never have any problems again. It worked for me.