I imagine he does as most players require it to work or don't work with it installed. I've had some skipping problems on my version of WMP, all with toku (mainly TV-Nihon's vids), but getting the right codecs seems to clear it all up.
Well obviously it must be with your XviD decoding. First of all I suggest trying Media Player classic. It's an open source player that actually decodes some things like audio itself.
If this doesn't work you'll have to work with what codecs that are decoding XviD that are causing these issues and see if those are updated. Perhaps there's some third party audio codec that might also be screwing up the playback.