Are you talking about eTrust ezAntivirus?
I've never had problems with that program. Did you thoroughly remove all traces of Norton before installing ezAntivirus? If you didn't you should uninstall both programs with Start/Control Panel/Add or Remove Programs, clean the registry if you have the right tools for that, reboot, disable any antispyware program running in the system tray and install eTrust ezAntivirus again.
I've uninstalled Norton, and cleaned all entries with "Norton" or "Symantec" from the registry manually (via regedit) ;-(
Apparently I can now make it work but ..... my Incredimail mailbox will still not open.... D√©marrer => rechercher only yields a blank window separated in two and there are certainly other things that don't work like they used to...
This is the reason why I hate changing things on my pc... it always mocks up something...
Bedankt in ieder geval