CNET’s Download.com site has been embedding adware into the install process for all kinds of software, including open source software like NMAP.  For the unwary, some of the ads could have been read to suggest accepting the advertised service (e.g., the Babylon translation tool bar) was part of the installation process.  Users who weren’t paying attention may also have clicked “accept” simply by accident.  In either event, after their next restart, they would have been surprised to find their settings had been changed, new tool bars installed, etc.

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