Alright, I'm not too computer... "Savvy", so could ya help me out a little?

When I download one of these clips and I go to play them in my media player it "plays" but there is no sound, or picture movement...




MY NAME WAS "SID" AND MY AVATAR WAS 800px WIDE

http://www.bartumus.com/bartumus/attfiles/SIDIOUS.jpg