I too had to remove Norton System Works including Norton Antivirus because of slowing down my PC more and more. I followed the following path:
- uninstall all components using Windows uninstall
- search and delete the following files and directories using windows explorer: Symant, Symevn(t), Norton
- search and remove from the registry the following items: Symant(ec), Norton, Symevn(t), Livere(g), Liveup(date), Livesu(bscribe). (the letters in parenthesis are for clarification only, do not enter)
- then do a regclean
- at least, my PC was still running after all this, and much faster. Of course, you have to install another antivirus program.
You will see, there are thousands of entries left in the registry after uninstalling Norton programs. I will never use one of these again. Hope this helps.