dvd decoder problem

  captain m 14:19 28 Jul 04

When I try to play dvd's I get the message - your pc does not have a dvd decoder. I have entered the correct power dvd cd-key number that came with my computer, but get the message, cd key invalid. I have contacted my vendor,they have given me other cd keys to try but same message appears.I have tried downloading free dvd software from K-lite codecs but this hasn;t worked. My os is win xp.Please help,

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