At Risk - Problem with macOS 10.12.4 and NIS

after upgrading o the new IOS Norton start to give an scan at risk and when I try to fix it keep trying to download updates but never do anything. It also brick all my browsers. I restore the Mac and when I installed the software again the problem persist, contacted service and the offer me to download the intelligent updater and solve the issue for a few seconds but when the safe web plugin was installed the problem appears again.

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