Played through VLC it's fine. Played through the boxee software on the PC it's fine. However played through Windows Media Player, not so great.
The two things HAVE to be related, but how else can I fix this?
I was tempted to get a laptop for the times I want to play stuff with subtitles or 1080p, and pipe it out via HDMI. However, does 5.1 sound travel through HDMI from a laptop?