Just a quick note so this info is "out there"  I have been getting numerous exception errors as I upgraded to a P4 with XP on it.   Errors were occurring at during editing/watching on the preview window and while rendering to .avi.  All details pointed to the aviplug.dll.  After much time spent with XP tweaks, I found that in my case, it was my RAM.
My system came with 256 DDR and I recently added a PNY 256DDR.  While I didn't check the RAM with a utility, I pulled the PNY chip and all errors ceased.  I have performed 4 render tests and edited on the machine for 60 minutes with no errors.
Thanks to all for their direct and in-direct help on this forum.  Best I've ever used.