[Michael Beard]

Back when I was using Internet Explorer, I went to Settings -> Internet Options -> Security -> Restricted Sites and added:
ad.doubleclick.net
ads.pointroll.com
http:/googleads.g.doubleclick.net
view.atdmt.com


I use Google Chrome as my primary browser, and I'm not having any pop-ups or redirects. Can't even remember if I did anything special in Chrome, just check to make sure you have at least the phishing and malware protection enabled:

Menu -> Settings -> Show Advanced Settings -> under Privacy, it should have the "Enable phishing and malware protection" checked.

I also have MalwareBytes.