That’s why I have no sympathy for those who shell out big $$ to have their computers “cleaned” on a regular basis. Not far from me, there is a computer business with a big vinyl banner out front: $90 Virus Removal!”. A person with ANY brains at all could buy a premium anti-virus suite with a couple of years worth of updates for that kind of money (or less). Of course, buying such software, installing it, then never allowing it to update, scan your emails and web traffic, and regularly scan your PC makes it about as useful as that anti-biotic the Dr. prescribed for the person with strep throat who takes it one time and then puts it on the shelf...
I had a virus I didn’t know I got (actually I got it, knew it, thought I had removed it, but apparently didn’t) that turned off my updates. I admit, I”m dumb enough not to realize I needed to check that, but I’m probably no dumber than most people. The bad thing is even my very tech saavy son and a few others couldn’t figure out what it was. Fortunately we were able to get all of my data off the machine and it was old enough that I didn’t really mind replacing it. With a Mac.