A Url:Mal pops up every 2-3 minutes.

I was just surfing the web and this popup comes:

http://i.imgur.com/DttUPQqh.png

The link ends with .com/k.js
I didn’t download anything malicious.
I didn’t visited any page that is suspicious.
It appears every 2-3 minutes when im surfing.
Help.

URL:Mal mean blacklisted URL or IP

You may have something trying to connect to it

For assistanse follow instructions > https://forum.avast.com/index.php?topic=53253.0