Sound not in sync?

When I play a DVD on my computer the sound is not in sync with the action. The sound is lagging behind 10 to 20 seconds.
What causes this?

Answers:
i'm not sure if it'll work, but try reduce the performance of the player(ie windows media or real media).

goto Tools> Options/Preference>Performance... the Video acceleration or Playback Performance or Sound card or Video Card compatibility. ]
no good sound card

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