i bet when you updated media player, you overwrote a bad codec;
my money is that it was that damn K-lite codec pack;
I avoid that now, because it ALWAYS messes with something in Media Player; sometimes makes the sliders stay locked, so y ou can;t adjust saturation, or tone or brightness...
Unless you REGULALRY use other media players to watch AVI or MPEG'S, its best to not install 3rd party codec packs.
I've formatted MANY A TIME because of this, so I speak from experience!
