I used to have a lot of troubles with adware poppin up on my computer but I find using both Spybot Search & Distroy and Ad-Aware ( http://www.download.com/Ad-Aware-SE-Personal-Edition/3000-8022_4-10045910.html?part=dl-ad-aware&subj=dl&tag=top5 ) keeps the crap off my computer :D Good luck!
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