Thanks every1 for our replies to my extremely OT question.
Lens, I have Spybot S&D, but this cookie keeps popping up "Advertising.com". Every refresh I do Spybot pops up a message telling me its a threat and do I want to block it. I say yes, naturallly, then delete it in Spybot Search and Destroy window.
Next refresh, its back!!!
Thats why I thought delete Cookies!!....Im not really sure?