Non hdmi xbox

I have a non hdmi xbox and wanted to know if it was possible for me to view movies in 720p plus quality that I burn or downlaod. I stream my movies from windows media player and they mostly drop the framerate and it looks somewhat choppy. It doesnt matter most of the time but it really is bad when trying to watch action movies. I wanted to know if abyone has any suggestions on how to improve the quality of the videos I stream fro my computer. Shouldd I Use vuse? Will buying an xbox 360 with the hdmi output improve movie quality on streamed videos? Thanks

It's probably your internet connection. Getting HDMI would not help with movie streaming.