I haven't tried yet playing a blu-ray disc, what driver version do you have? Try using media player classic home cinema (you're using Xp right? You have to enter in the options, and disable the internal h264 filters, then in the external filters section load up the cyberlink one, and select "prefer". Open cyberlink filter properties page and check that dxva is enabled. In output section select vmr7 window). Then file->open dvd.
The GMA500 Guru: ask me for every video problem! (Or if you desire a perfect video experience)
Win Xp, Driver .1016, Full Hd Youtube Working; Win7, Driver .2019
Dell Mini 10, HDD Momentus 7200.2 160gb (best 2.5" access time