I have and E machine with 3400+64amd athlon processor, 100gb hard drive,dvd+/rw, 512mb.
I recently did a complete reinstall and it worked great until about 2 weeks ago when I suspect that it downloaded those service packs that cause problems like this. I oculd be wrong on that.
Anyway it will play videos good at startup for about an hour then if you go back to play another one no sound.
Thanks for any help