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Windows 10 Defender has shut down my Norton Security
I've discovered recently that Windows Defender has now taken over my PC security. I can't shut it down. Also, Norton won't start up. Now I've tried by the menu and icon, and in Services, but I haven't tried anything by command-line. If it's malware doing this, I haven't noticed any great degradation in my PC's performance. I made a search, and I don't see anyone else describing a problem like this, so it didn't occur until now that it could be malware, that is, other than Microsoft's.
Has anybody else seen this, knows what's causing it? Does anybody know of a remedy?