You really ought to consider that young people with carpal tunnel syndrome could be reading this.
I got a call from a non-tech-savvy friend a few years ago. She said that her PC had slowed to a crawl and asked if I could take a look at it. It was taking nearly half an hour to boot up.
I spent hours clearing out all the viruses and other assorted malware which were clogging it up. It turned out that her 2 rampant teenage sons were visiting every dodgy porno site they could find and were installing anything that the sites asked them to in order to gain access to the precious 'material'.
Once I had scrubbed the machine free of infection, I made my friend the system admin and took away her sons' ability to install anything. I explained that she would have control of what did or didn't get put on the machine.
I got another call a week or two later. The machine was slow again. It turned out that she had got bored of being hassled by the lads to install things for them and had simply handed over her password ....
