I've been having this problem for quite a while and it's driving me crazy! There is a steady stream of static that comes out of my speakers whenever I play music or videos.
There's no static when nothing is playing. I've tested with two other sound cards and the static persists. It's not the speakers because when connected to another computer they're fine. It's not the cables either. And the weirdest part, if I play video with Media Player Classic - Home Cinema installed using LAV decoders, the static disappears.