Security Shield is a typical rogue antivirus/antispyware program that crazily attacks computers in the past days. Security Shield uses Trojans to help its invasion on the target computers, and applies fake scan and false detected infections to scare people into buying its fake utility. Security Shield should be removed without any hesitation.
For useful tips on Security Shield analysis and removal instruction, please read the post below:
Remove Security Shield Fake Antivirus - Help for Security Shield Removal
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