Sorry being on dial-up I don't go looking at videos.
Why not tell us on the forums (that will be trying to help you), what eicar files and what connection HTTP or HTTPS was used for the download ?
# HTTPS as Logos now confirms, can't be scanned by the web shield.
You could help those who will try to help you by including in your signature some system information, and crucially avast version in full, e.g. 5.0.545.