Vision Express 3 shuts itself down...video file problem? or program?

Hey guys, I’m trying to burn some tv episode AVI files to a DVD-video in nero vision express but it seems to shut itself down with no message every time, mid way through the image creation progress. i’ve created other dvd’s with similar AVI files so i think it’s a problem with my video files and ive checked the with G-Spot, but i was wondering if anyone else had this problem or if this sounds liek a program problem.
G-spot tells me that my files are Xvid (not DivX) encoded and that i ahve 2 codecs installed (which i do, i installed the codecs the other day). maybe i should get the program that changes the four CC code?
please help!