I need some help. I recently started using my 360 to stream movies from my pc using windows media center. I have some 1080p mkv files that I have been trying to play. They play, but the quality is horrible. Very grainy and they have fps issues. My network is hard wired, but it is about a 5 year old router. I installed the mkv codec back on my pc. I am running windows 7 ultimate. I have played some 720p content x.264 that looked fine. Any suggestions on what could be wrong?