When I Google certain keywords, this link pops up in a new tab...How do I get rid of it?

This link:

http://fazher.com/se.php?pop=1&aid=YmxhY2tvdXQA9D8&sid=11135230&key=flower

popped up just now when I was Googling Malabar spinach flower. It then forwards on twice to different URLs and eventually ends up on some random site about whatever the keyword picked up was (a site w/ ads on it for flower sales, e.g.).

It just started happening yesterday, right after I tried to visit kapaluafarm.com or something, which was supposed to be an active link but was not found I think… Doesn’t happen every time I search, just sometimes.

Looks like some kind of spyware / virus / malware / bad and annoying thing.

How do I get rid of it? I ran Avast anti-virus on C-drive yesterday and it did not detect anything.