To play .ogm this is what i do

first I install these files

1. FFdshow: http://prdownloads.sourceforge.net/f...3.exe?download (there are other versions, but this is what I use)

2. Vobsub: http://www.filemirrors.com/search.sr...obSub_2.23.exe

3. Ogg Filter: http://www.vorbis.com/files/1.0/tobias/OggDS0995.exe

3. xvid: http://www.stargeek.com/item/36425.html

After I have installed those I open them with Media Player Classic (not windows media player)

Here's the link:
for 2000/XP version: http://prdownloads.sourceforge.net/g...5.zip?download

for 9x/ME version: http://prdownloads.sourceforge.net/g...5.zip?download

And that's it

There may be newer versions of the programs

The quality is very good