happened to me also
i had a compaq laptop with winME
i put XP on it but the dvd encoder was not compatible...i could dload it for free earlier
but as time passed on, they didnt provide d updat nemore cuz it was a very old version
so i looked on da net for ages and finally found a free one
u can find it at
www.cliprex.com
dload da 'fraunhofer ac3 and dvd decoder'
but sometimes it doesnt play properly, like da top half of the screen flickers for a few seconds then it becomes fine.