I can't burn discs anymore. I'm using the same computer and havn't made any major changes. Allthough it has been months since I've used it. I havn't had a chance to contact salesintl.com support and thought I might find quick help here,
Try uninstalling the program and then do a fresh install. May or may not help. DVD X Copy is old. Try some of the more uptodate programs you will find as discussed here. Some are free, some are paid, some have free trials. DVD Shrink, DVD Decrypter, DVDFab Decrypter, and VOB Blanker are free and work well together in various combinations depending on the movie. Search the forums for info. Some programs may need a Google search to find.