Your hosting company is wrong.
They host malicious website(s) on the same IP:
http://urlquery.net/report.php?id=9238621
http://zulu.zscaler.com/submission/show/7cd02d3081f824786b9e6121380f49d2-1391614962
http://quttera.com/detailed_report/www.samslobsterbakes.com

That is why avast is blocking the IP, not just the url.
You can ask to unblock the url here : http://www.avast.com/contact-form.php