"Windows Media Player cannot play the file because the required video codec is not installed on your computer." I'm running windows media player, version 9, on windows XP home... I was trying to play a .wma file that I've used hundreds of times before on my computer (actually, a short playlist of wma's) but I got a player upgrade recently, and now, all of a sudden, my computer can't play my favorite AMV's. Any idea how to fix this?