some DVD's wont play

  vally 12:25 02 Oct 08

"Windows media player cannot play this DVD because there is a problem with digital copy protection between your DVD Drive, decoder, and video card"
strange this because I have 2 pc's with the same system,same MP11,the same Radeon 9250 graphics card, latest drivers, both have Xvid and XP codec pack installed and yet one pc won't play some DVD's whereas the other will play anything
I cant think what else is needed, anyone know what else I can try?

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