Welcome to the forum
Probably Moviemaker shut down because you are trying to edit only one vob file. You need to have all VOB, IFO and BUP files on the same folder, because these files contains essential information about the movie and are all connected. For what I know you can't edit directly the vob file without reading first data contained on the IFO files.
A better choice, however, could be a video editing software like TMPGenc DVD author or DVD Lab pro. Both too bad are not free, but you can try to use a trial version for a while and then decide if purchase or not.