Do you have:
1. Any Matrox hardware installed?
2. Any Canopus hardware or software installed?
3. Any downloaded codec packs?
4. Any flavor of DivX or XviD installed?
5. Any software DVD players?
Sorry if I missed any answers in your earlier posts.
Do you have Premiere Pro 2 installed? If so, can it play back your avi file without error? Encore 2.0 and PPro 2.0 share the same playback engine.
Other things to try:
1. Clean and then delete the Media Cache Database. The controls for that are under Edit>Prefernces>Audio/Video Out. Test preview after cleaning, and if you stil get the errors delete it and try again.
2. Also under Edit>Prefernces>Audio/Video Out, uncheck Automatic for the Video Playback item. See if that helps.
-Jeff
The Focal Easy Guide to Adobe Encore DVD 2.0