Elderly couple who I help with their had a dialog pop-up at start up. Contained message that their computer was blocked and to call a phone number. They didn't, they called me. I advised them to cold shutdown and restart. This was successful. I have them running their AV - Windows Defender (they live on a fixed income).
My question: In the original dialog was the following URL: flunlyismnestorianism .com
Is this a virus?