Quote:
Our Oct. 8 Top Story by contributing editor Susan Bradley reported that Google, Bing, and other indexes need to do a better job of policing the ads that appear alongside the search results.
Immediately after Susan's story was published, describing malware ads that appeared alongside queries on security terms like malwarebytes, such ads temporarily disappeared...
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But they came back

Read the rest of the article here:
Tips for avoiding bogus ads in search results - Windows Secrets October 15, 2009.