It's not just kids or recreational users - I know people who have worked in IT for companies for 10+ years who are utterly clueless when faced with a virus.
Unfortunately that's true. It always amazes me how many "computer professionals" haven't the slightest idea about how computers work. I'm talking about the fundamentals. -- Don't feed trolls--it only makes them grow!
Installing the free MyCleanPC scanner and running it using the default settings resulted in 1,020 "issues" on a PC with a week-old, barely-used clean install of Windows 8 running on it.