While eating, my landlord knocked on the door. He said his computer was working, but he was having problems with the internet service provider, who were complaining that he had a virus. I said that I didn't know what to do, and suggested that he contact a computer service professional. He said that he'd talk with the pest control person who was scheduled to come to the building tomorrow, and he'd ask her to fix his interwebs.
I shall declare ignorance in the future.