Need help with possible trojan


I was working on today and after closing all my browser tabs, I received a notification from my anti-viral software that infected web pages were detected. I've uploaded a screenshot for you to see what I'm seeing.

Can you please tell me if this is a trojan. I'm told by my host that it has to do with Hummingbird. It could be a false positive but I don't want to take a chance. Any help would be appreciated.