Also, when Norton was deleted did they just use the uninstall tool provided by Windows or CCleaner or did they use Norton's own Removal Tool? You see Norton is notorious in leaving drivers behind so much so that they had to create their own tool for their own product to make sure all their drivers are removed.
3 years ago I helped someone here who was having issues. The minidump showed a Norton driver as the culprit. The thing was they uninstalled Norton 6 years previously but for some reason it decided to "engage" and thus conflicting with their current security software.