HTPC won't display DVD subtitles

I am in need of some enlightenment


After endless tinkering I've come to the point where I'm pretty satisfied with my HTPC. Last night I decide to catch up on some DVD's and I put in the Brazilian movie City of God. The English subtitles don't come on (even though I select them). I try playing the movie on PowerDVD 7.3, Media Player Classic, VLC, WMP, and still no subtitles (and in every case the player recognizes the subs but doesn't display them). I then try some other discs and get the same result - no subs. When playing HD-DVD's, however, the subs work fine.


I'm running XP Home SP2. I have tried uninstalling all the codecs and still nothing.


When I boot into Vista, the subs work fine but I would much prefer to have the system work under XP (more support and less clutter - for my taste, anyway).


Any ideas would be greatly appreciated.