HTTP Zombie Tool Exploit??

Hey guys so it appears I may have went on an infected website or something and now it appears as if whenever I go on the internet I'm being attacked by a program called HTTP Zombie Tool Exploit. I have made sure my norton is up-to-date and have scanned by whole computer but alas, nothing. What should I do in order to get rid of this?? 

 

Oh and sorry for my lack of knowledge on viruses and and such lol