1up has the "low" version of the trailer, at least that's what it's named in the filename. Still ~450MB.
You can boost the priority of your video player in XP. Pause your video, right click on the taskbar and go to Task Manager. On the processes tab, right-click on your video player, select priority, and raise it as needed. Start with aboe normal and go up, giving the video and audio time to sync up. If you use real time, be warned that if your video player locks up, so does your box.
Edit: "High" can screw things up too, as i just realized. Took me five minutes to close WMP on my 1.4GHz AthlonXP. It would be better if i had a video app that disabled audio since the audio track is fairly demanding as well. i had to transcode the video to MPEG (one, not two) last night just to watch the video without stuttering.
i think the game would look great in HD, in whatever resolution it's native, but still not leaps and bounds over DoA3, unfortunately.