A few years ago, my father-in-law asked me to fix his computer. He only said it was "slow". When I got there, he had a serious malware infection. Multiple sp

A few years ago, my father-in-law asked me to fix his computer. He only said it was "slow". When I got there, he had a serious malware infection. Multiple spyware/hijacker browser extensions, a service running on the desktop that would pop open ads, the works. He said it started doing this stuff after he installed an iTunes update. It took me way more effort than it should have to convince him that the ad that claimed to be an iTunes update was fraudulent and started the mess. After I managed to clean up the mess, I installed uBlock Origin. It's been smooth for him ever since.