http://forum.bsplayer.org/viewtopic.php?t=3042
For xvid.dll problem: Install xvid 0.9.2 from the post above
For AC3 problems, install AC3 filter from above post. Sometimes it fix problems created by an old AC3 decoder that comes with codecpacks.
Directx 9 is recomended.
For magno: please use english so anybody can understand.
FFdshow is a filter that can decode some different video streams. But codecs from their developpers works better. So, use the codecs, this is my advice.