1. Viruses and worms forum section is for posting virus and false positive problemes

  2. What you see (the screenshot) is a HTML:FakeAlert

Fake alert videos
https://myonlinesecurity.co.uk/some-videos-of-typical-tech-support-scams/
https://www.youtube.com/results?search_query=fake+virus+alert

If you post the URL here, avast can add it to URL blocker