I got Norton on the phone and he could hardly speak.Norton did what it should when installed- it properly turned off Defender and every indication is that is off.
I have one user on the network I am running whose Virus Definition File date will not update.
And new Vulnerability Protection blocks security holes in your PC’s operating system, applications, browsers, and browser plug-ins to prevent hackers from exploiting them.
I have a Symantec Corporate Edition 10.01 since 2006 and the definitions stopped updating the first week of July 2013.
As I said I have dealt with 2 support engineers and 1 supervisor and all they have done after hours of trying to "fix" the problem is get the failed definition to install insisting that the problem is now fixed- they turn Norton off or uninstall it, turn Defender on, install the definitions then turn Defender back off and Norton back on or make me reinstall it.
One engineer went so far as to say the problem is because Norton Security is *NOT* compatible with Windows 10 and went even further to say that because I am using it I now have viruses and corrupt files.