Whenever I use any of my programs with divx avi files they crash,
xxxxxxx.exe program has generated errors and will be closed by windows.

This happens with Adobe premiere 6.5, Ulead videostudio 7, dvd movie factory 3.0. When I start generating any output.
All of these programs are purchased originals (so there's no dodgy pirate copies causing errors) including the divx codec, I have recently upgraded to version 6. It was happening with version 5 too.
I am running W2k with SP2 on a P4 2GHz with 1Gb ram.