I installed VLC and the Combined Community Codec pack (full install)- when playing most files in MKV and a few AVI files, the volume of people in the movie speaking is very low to non-existent. This is in sharp contrast to the background soundtrack which is very loud - I can hear the music and background noise very well. Installing and reinstalling did not solve my problem. The files are not the problem - I experience the problem in XP Pro SP3 RC1 (and SP2 before) but playing the file back in VLC in Vista Ultimate x64 was problem-free.
My soundcard is - Creative X-Fi Fatality (original 96Kb version) - changing the audio mode in the Creative console does not solve the problem.
So yeah can someone help me solve the problem? Rebooting into Vista every time I want to watch a movie is annoying....