By Robert Lemos
Staff Writer, CNET News.com
A study of home PCs released on Monday found that about 80 percent had been infected with spyware almost entirely unbeknownst to their users.The study, funded by America Online and the National Cyber Security Alliance, found home users mostly unprotected from online threats and largely ignorant to the dangers. AOL and the NCSA sent technicians to 329 homes to inspect computers.
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http://news.com.com/Plague+carriers+Most+users+unaware+of+PC+infections/2100-1029_3-5423306.html?tag=alert for more info.