I have a whole bunch of XVID files I have ripped from my Babylon 5 DVDs. I watch them instead of having to get the disks out each time i wish to watch them. They are stored on an external hardrive so drive space isn't an issue.

On to the problem... When ever I try to watch them in Zooplayer. Windows media player, or even virtualdub the audio appears to be in sink with the video, but as time progresses the audio is no longer in sink. If I click somewhere in the middle of the video the audio retuns to being in sink, but it begins to go out of sink. VideoToolbox says I have the codec installed. The file will play correctly in media center, but I would rather use zoomplayer. The files work fine on other computers. I have checked some other files that my friend has ripped to his PC and still the problem persists. Any suggestions?