Help! im a mac user, and a URL:Mal i probably destroying my laptop

So i keep getting a web shield block, from a website

http://s.vb3k.com/crossdomain.xml, so i foolishly went to the website and avast said that the website probably harmed my computer, and i dont like getting pop ups every 5 minutes, from before i went to the website. it blocked a total of 4 different kind of files. from the one website.

This is a Windows forum.
You can find the mac forum here:
https://forum.avast.com/index.php?board=5.0