False Positives on Google Cache Pages?

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Starting yesterday, regardless of what I am searching. if I click on the google cache link I often get this same warning about drive-by downloads when the page is displayed.  Are these errors real or some sort of false positive?   NIS 2010 v17.0.1.19

 

Untitled.jpghttp://safeweb.norton.com/report/show?url=74.125.93.132