When playing the DVD, wich filters are used by BSPlayer ? To see that, play the DVD, rightclick -> options -> filters. My guess is that you don't have a DTS filter (such as AC3Filter or DTSAC3filter). Also, by default, Vista tends to put up to work Msoft's MPEG2 decoders (nasty ones) instead of INtervideo's or Cyberlink's ones.
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