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Symantec and Microsoft join forces to stop a botnet, and for the first time they provide clean-up tools directly to people with infected computers.
More than 120,000 Windows-based computers running Internet Explorer 9 are infected in the U.S., researchers say.
The botnet has targeted at least 202 Web sites that serve 14 billion ad impressions. The botnet apparently accounted for 9 billion of them.