This thing is slow my pc down and i cant seem to get rid of it?

there is something running on my pc that every time i go to a website it maxes out my cpu and freezes everything for about 35 to 45 seconds befor i can do anything on my pc. this happends on every page refresh on newwegg.com and a few other websites. i see it loading on the loading bar. its under b.scorecardresearch.com. ive gone to this site and looked after i seen this. its apparently tracking all my internet activity and i never opted in for participation. i found an out out for particapation on there site but yet its still happening i have since sent them a very mean e-mail. i also see something loading called a.rfihub.com and along with that loading it says REPLACE_ME_WITH_YOUR_CACHE.... and the line gets cut off there. i think this is some kinda malware to. ive tried about 8 diffrent anti malware and anti spyware programs.. none of them are stoping it or even detecting it as it loads. if anyone has ANY advice on how to get rid of this plzzzz let me know im not liking to wait a min for every page i go to to load befor i can even minimize the page.