I've got Norton Security With Backup. It automatically updates frequently. Today I started getting a popup message every few minutes saying "Norton LiveUpdate Restart Required." (See attached screenshot). I didn't click "OK" because I suspected phishing or worse. I checked my Norton, it said "You are protected. Protection Updates: Current". And then I cold-rebooted my machine. The popups continue. This is either (1) a bug in Norton, or (2) a sophisticated-looking phishing expedition. Please advise.