It's simply a case of plugging the XB360 HD-DVD drive into a spare USB port and letting Vista install drivers automatically.

Then you need to install PowerDVD Ultra, which supports HD-DVD, and you should be set.

Obviously the above assumes you have a PC with an HDCP graphics card, and also a HDCP compliant display connected via DVI or HDMI.

I think the Vista drivers for my graphics card are a bit flaky at the moment. There doesn't seem to be any adjustments for the video side of things, hence my question about Purevideo.