may also not be on your PC - hence why you can't find it. Do you use Microsft Messenger - if not is it disabled? This will help grc.com/stm/shootthemessenger.htm as some companies are now using this to advertise. Also ensure pop ups are disabled and use a pop-up blocker - best I've found is toolbar.google.com
As you get this with 'some sites' and not all, it could be script implanted into the host page.
non of these programs have helped, its still comes up on the same sites. i cant use my popup stopper cos since this miraclesearch has been coming, my toolbar dont startup any more and i tried reinstalling it but it still isnt there. one site that this popup comes everytime with is click here, i click the official button then it pops up, ive used this site for about a year and never had problems. it also pops up in the spybot link above everytime. any more suggestions or questions?