When trying to unload am met with this (below) or a kernel panic. It seems that 4 items still remain and I am unable to remove them. I have tried file cleaners and the standard norton uninstall cleaners. However, when adding Avast I found that Avast will not install due to existing Norton/Symantec files existing.
I proceeded with the standard Norton uninstall and found that it seemed to work.
I removed Norton after having problems with it interfacing with MacOS on many levels.