Adware Can't be Found

So there is an aggressive adware on my PC. A bunch of ads pop up everywhere and they say " Ads by DNSUnlocker". I tried to find the program file myself and remove it however I couldn't find anything, so I went to Norton. First I used the NPE, and it found 3 threats and removed them. That didn't work so I went to get Norton Security itself to see if that could solve my problem. I did a full scan and it found 1 adware file and some other cookie tracker. When I saw the adware I thought my troubles were over and had it removed. However when I went to check to see if it was still there, it was, popping up all kinds of ads agian. I even restarted my browser and my PC, but that did not work either.

Therefor I came to the forums to see if there are any suggestion as how to fix the problem.

 

Thank You,

AP