Norton™ Safe Web

I'm normally very consistent with what sites I go on, but lately I started going on Yahoo!Answers often, just for fun. When I had few issues before, after going on yahoo answers daily, my computer began having major issues and almost crashed. Neither Norton, Spybot-Search & Destroy, or Malwarebytes could find the issue. I had to use an online scanner called ESET I had been given the link to by a Spybot-S&D support member to search my computer, and remove the threats.
While I doubt Yahoo itself is a danger, the ads are another story, it seems.