Well, Microsoft's solution didn't work.
Cunningly, I moved the file that they said to delete - now I am going to copy it back and uninstall this Defender thing - with the file copied back I know I won't get some kind of uninstallation headache as well.
Cunningly, I moved the file that they said to delete - now I am going to copy it back and uninstall this Defender thing - with the file copied back I know I won't get some kind of uninstallation headache as well.