system
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I’ve been around computers long enough (45 years) not to declare total victory, but I’m glad to say that thanks to this forum, and sharky7sharky in particular, I’m back in business for the moment, and this is being written from the problem computer. The miracle ingredient was renaming the .sys file in windows/system32/drivers/. There had been one in the system32 directory itself, for whatever reason, but anyone, Avast is now uninstalled, and the PC works for the moment. I’m now not sure, of course, whether to try reinstalling it… But at leas if I do and it all goes wrong again, I shoud have a fair idea what to do next time. Wish me luck, and again, thanks.