I would suggest converting one of your VOB files to a different format, such as Windows Media Video (WMV).

If the problem does recur in the WMV, we would know that the problem is happening during the decoding of the VOB file. In that case, the first thing to try is to reinstall the MPEG 2 decoder. You may also need to disable other MPEG decoders. You can do this by opening the Tools menu and choosing Settings, the switching to the Compatibility tab. Uncheck all MPEG decoders. The GPL MPEG Decoder does not appear in this list. This is normal. The GPL decoder can't be disabled.

If the problem does not occur in the WMV file, then we know the error is happening during the encoding of the DV AVI file. If the WMV file is correct, you may be able to fix the DV AVI issue by upgrading DirectX on your computer. You can download the latest version of DirectX free of charge from Microsoft here:

https://www.microsoft.com/downloads/details.aspx?familyid=2da43d38-db71-4c1b-bc6a-9b6652cd92a3&displaylang=en

Unless you have a specific reason to use DV AVI, you may want to try using another high-quality video format such as MJPEG-encoded AVI, which gives you more control over the video resolution and audio quality.