alright well which filters do I use? it doesn't really say.
Koivu -- this word means "birch" in the Finnish language and it is a common family name too. Are you perhaps from Finland? (I am.) Welcome to the forum anyway,
For Xvid playback I would recommend the most common solution amongst MC users:
Uninstall all old installed DirectShow filters and start with installing the CCCP codec and filter pack. (The link gappie provided redirects to this page:
http://wiki.jrmediacenter.com/index.php/DirectShow_Playback_Guide. It has a chapter about CCCP.)
CCCP consists mainly of a "known to be stable" version of the FFDShow filter pack, some additional filters and well tested default filter settings. Some other compression formats may benefit of additional filters, but for Xvid CCCP should be fine.
EDIT
I was typing this answer when you posted your last reply. I didn't change it because it may be useful for others.