An official explanation from Safer Networking stated that the error was caused by a bug in the program used to build their code.
The result of the bug was that users had difficulty enabling Norton Internet Security to make necessary changes to critical registry areas, such as allowing itself to launch on computer startup.
Kaspersky seems to be reluctant to fix the issue, despite receiving several complaints.
Incompatibility between the products might occur when Spybot S&D tries to modify the hosts-file (if selected by the user during immunization), which Kaspersky will interpret as an attempt to harmfully manipulate the file.
Occasionally, you may also receive pop-ups that inform you when systems have been changed.