I've been told by a friend whose computer I help maintain that her system (Windows 7) has been infected by Security Shield. It appears to have been delivered by either an email attachment or link in an email from a known correspondent. Not knowing anything about Security Shield, I began searching for info and discovered it pretty well hijacks the entire system, even blocking currently installed security software. Her system has MS Security Essentials installed. What recommendations do you have for removing the rogueware?
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