mencoder dvds ripped won't play in windows

Greetings, I am just curious, what codecs do I need to play back dvds ripped with mencoder, and where do I get them.. Windows media player says it can't locate a suitable codec for play back. I assume there is something fishy with the way I rip the dvd, it does play fine in kaffiene. Here is the command I use...(line probably wrapped) mencoder dvd:// -dvd-device /dev/cdrecorder -o movie.avi -oac copy -ovc lavc -lavcopts vcodec=mpeg4:vbitrate=1800 Any clues will be greatly appreciated... THANKS Chadley