I wanted to watch a show on couchtuner.eu (a friend recommended, I hadn't used the website before). I carelessly followed some Java link to update, and…now I have ads everywhere, pop-ups, etc.
Ads keep popping up under my Google homepage, I have a "call computer support" ad that keeps popping up in the upper right hand corner of websites I visit, etc. I deleted all the Java I could find on my computer, but it's still happening.
I have a fairly new mac laptop (about a year old), OS X 10.7.5.