I've been having a persistent problem with these two codecs. I have Family Guy in ogm format. In the past, I have been able to d/l the correct codecs for the files to play correctly. I think I got the ogg vorbis codec and DirectVobSub. I did not reformat, nor do I remember deleting any of the codecs, but now I get a green screen instead of video (as was the case before). I have audio so I'm assuming that means my audio codec is fine. What video codec do I have to d/l to get these ogg files working correctly? I'm having a similar problem with XviD, audio but no video. Which sites will have the codecs I need. I've tried Nemo and the Kazaa codec pack but still no luck.