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My son tweaked my W7 for me so that I dont get the W10 nags and I can still get any updates that come along. I think my Malwarebytes might have caught the wannacry. It froze up my computer a couple of days before that came out and put a note on the screen to shut it down after doing a particular procedure that shut down background stuff I wasnt even aware was running then said for me to leave it off until 0600, about 7 hours later. I did it like that and it is running a lot faster since. I really dont know what that was all about and am just guessing because of the timing. That's very interesting. I don't know whether the stuff Malwarebytes was responding to was WannaCry or something else, but MalwareBytes is a terrific product and I trust their products to do the right thing.
I was a faithful user of McAfee for years but got bit by a virus about once a year. Then my son introduced me to MBytes Free and I switched to that. I have not had any virus in 6 years. I did finally buy the Mbytes when I got an offer at $14.99 for life. That was much more satisfying than McA's $39.99 a year.
I got one of those ransomware things way back (W2000) before I had heard the term. It was one telling me my machine was infected by billions of virii and I had to send them $99.99 to buy their antivirus fixer. I fought through their dozens of popups and tweaked settings with my son on the phone until it all just went away.