ClearCloud

I set this up in my router. Pretty amazing. Covers all my PC's. You can set it up on individual computers if you like.
You can't tell it is there until it blocks a bad website.

"ClearCloud is a free service that checks every website address your computer is trying to access, whether you're browsing the internet, clicking a link in an email, or a program "under the hood" trying to communicate with servers for information or updates."

"ClearCloud prevents you from being able to access known bad websites, sites that will download malicious files to your computer. Even better, ClearCloud prevents you from being able to access malicious websites that you may not even know your computer is trying to access — and it prevents potentially nasty programs from "phoning home" and secretly communicating between your computer and cybercriminals."



Website Here

So far I have not had any trouble with ClearCloud.
Here is a video of ClearCloud at work
The light blue line is ClearCloud blocking malicious ads.
You will see the good ads appear.