I saw a post by ScottyMac that says to use these:
It's your environmental settings.
Do 'em like this...
DirectShow Multimedia File Reader.......3
AVI2(OpenDML) File Reader................1
AVI VFW compatibility Reader.............0
CyberLink MPEG-2 Decoder.................0
Microsoft MPEG-1 Decoder.................0
Wave File Reader..............................0
BMP/PPM/TGA/JPG File Reader...........-2
DVD2AVI Project File Reader 1.76+.....-2
TMPGEnc Project File Reader 2.58......-2
I am going to try them myself, as I skewed mine trying to fix an encoding problem that turned out to be nothing more than a full disk TMPGEnc was using to store its temp files on.