Download Kaffeine, Kplayer or Mplayer...
Copy the Essential Codec Pack from here :http://www.mplayerhq.hu/MPlayer/releases/codecs/essential-20050412.tar.bz2
Unzip and copy to /usr/lib/win32 or /usr/lib/codecs (make these directories if they don't exist.
I'd be careful recommending your foreign hacker sites from now on!