This sounds like my visits to in-laws. Walk in door and "oh good you're here, can you have a look at the computer that is in the study..."
Winner, Winner, Chicken Dinner!!! My father-in-law...he didn't ask me for like two weeks and then he said he couldn't get the Wi-Fi to work, it went down hill from there. He felt really bad, it wasn't his fault...even I cannot tell some of these malware website pop-ups from legit stuff on occasion...they have gotten really good.
Long story short, fixed it good as new...but it has renewed the burning fire of hate I have for Windows.