When reporting issues with Anti-Virus alerts, please complete following steps:
1) Make a screenshot of a page where you get the Anti Virus alert
2) Upload screeshot to http://tinypic.com/ or http://imageshack.us/ and send us URL of the image.
3) Write down all the details and url's that you get from your Anti Virus program.
4) Tell us from which country are you watching the video.
That should help us to troubleshoot the issue much more quickly.
Thanks for helping us make the site safe for the community!