DVDs play in Media Player, but no sound

[Peter McL]

Not sure if this is the right forum, but here's the problem. I've just installed Windows XP, and at first Media Player wouldn't play my DVDs (said no DVD decoder installed). Since installing AnyDVD (thanks to a tip in the DVD Backup Forum), it will play DVDs, but bit jerky and no sound. What do I need to do? I've got ffdshow which solved the sound problem when I had W98SE, but doesn't work with WXP. Do I still need a DVD decoder, if so how do I get one?

Thanks

Peter