I had the same situation as KrewBlues. I also installed the Norton Trial instead of Windows Defender. Today I realized maybe Norton was causing a bunch of issues I've been having. I tried to uninstall Norton. I was prompted to turn on Defender as the uninstall was running. I (stupidly) assumed it would give me a dialogue to turn on Defender, but apparently it just went ahead and started up Defender during the uninstall. Needless to say, both processes hung. Went back to re-start uninstall but no sign of Norton. Went back to add update to Defender, turn on Firewall, etc and now nothing responds in action center.
Any ideas how to attack this? Please?
Thanks so much,