I would only recommend the lastest ffdshow build.
And check your manual, if the card supports at least overlay 1 (YUV420) colorspace. For DVD support its used YUV422 (mode2).
So, if your manual says about DVD support (hell, even oldie SiS 630E chipset have DVD playback support!!!), then your card support overlay and problem are into drivers or so.
...well, and at least, dude, get a decent nVidia card
(avoid ATI, tought - problems with drivers, too crappy - see
http://jlx.host.sk/doublescan/news.htm)