The bleeping computer link from Al94 shows how spasmodic and widespread is this problem. In effect I think MS did a new clean install of 1809 on my desktop, but also changed the DNS profile as in the article. Also I use Defender, the update of which is also mentioned in the article. I will monitor my desktop that is now fully up to date, but leave the laptop to see if MS updates sort themselves out . All in all a very confusing matter
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