hi , not sure if this is the right place for this question , but here goes , when using windows media player , watching hd movies downloaded from the net , i get no sound , i have a coreavc codec installed on my laptop , the picture is fine , an error message says i need an audio codec , when i download the suggested one ( suggested by windows ) i have sound but freezing picture , as if the corecodec is not working , vlc player , media player classic and other players wont work for me ( i have vista ) any help would be great ?