I have done the reinstall of powerdvd and the hd-dvd works in small screen mode but struggles badly when full screen mode is enabled. I think it is a case of the HD2400XT just cannot manage running HD movies at that resolution. Which goes against ATI's marketing for the card, but what can you expect from a £40 card with a 64-bit memory interface! Will probably get the HD3870 XT soon, as it is so cheap for the performance.