Can anyone advise me what I can do? I've had several contacts from colleagues to say that they can't get to the site, and all are using Avast. I can hardly tell them all to reinstall Avast, and of course that only affects people who know me...
report it to avast lab again and see what happens you may add a link to this topic in case they reply here

report it here. http://www.avast.com/contact-form.php