I had exactly the same problem this morning, following a windows update last night.
I uninstalled “Security Update for Microsoft Windows (KB4013429)”, which was actually second on my list of recent updates, and it worked a treat! As @donmcybertect said it did take quite a while for the uninstall and restart to complete - over 30 mins for me.
Thanks so much for everyone’s contributions here, especially @DaveR - you’ve saved me from pulling my hair out!
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