Inspired by this, I downloaded Anti Malware and ran it too. It found 250 rogue items deposited there by something which I *thought* was a piece of clean-up software but which turned out to be exactly the opposite. I run Norton Personal Firewall and a thing called ESET 32 which is very good although not well-known, but whatever this was just sauntered right past both of them. Too soon to know what effect this will have, but just doing it makes me feel better!