Should you continue to have errors with Symantec/Norton after using their uninstaller, you can do the following:
- Create a restore point. Go into Safe Mode > Search > All files and folders > Advanced Options (make sure all boxes on the bottom are checked off except case sensitive) > type in the TOP box in the left pane "Symantec" or "Norton" or NAV (Norton Antivirus) > click "Search. Anything that shows up in the right window pane should be related to Symantec/Norton, but if in doubt, right click it > Properties to see. If it is part of Symantec/Norton, delete it and put in the Recycle bin, and empty the bin while in Safe Mode. Reboot.