CCCleaner is an excellent program. Not for the uninitiated or faint of heart, because you can do serious damage to your OS with it.<quoted text>
I think Topix has been doing that for a while because I have noticed when I come on Topix the advertisements are for stuff that I have recently shopped online. I run CC Cleaner regularly to try to keep that crap cleaned off my computer.
Avast is what caught the malware. Curiously, the popups stopped. For awhile there they were coming up with each page. The service must be on a timer.