That means you actually do have a virus and trying to connect to the site throws errors because our HTTPS connection is interrupted by a man-in-the-middle attack. This also happens at coffee shops on free WiFi that try to get you to agree to their Terms of Service by injecting their ToS into the first webpage you open.
Also, as JGOTI said, AVG is hostile to the community. Please select better software. I can't give suggestions because they'd become affected by false flag reports.