Hi stevedw,
Has your DVD recorder burnt the disc with a different-to-norm file structure, instead of audio_ts and video_ts the files are named differently? I had a DVD recorder that would burn discs in non-standard format.
I am a bit puzzled by your comment on Nero, I have all Nero features installed and the file size on the HD is less than 80 megs (including application data entries), if you are going to edit video I wouldn't have thought size was an issue.
Try a google on DVD or VOB editors, there's stacks of video editing software about.
Hope this helps
Muskrat