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Security Fix – What To Do When Scareware Strikes.
First thing: Take a deep breath and don’t panic!

Overall, these results show that Security Essentials holds its own as a free standalone antivirus app. As with most other options in that category, it doesn’t provide a firewall, behavioral detection, or other security extras. But since Vista and Windows 7 already include a two-way firewall, and you can add top-notch behavioral protection with another [...]

Every system should have atleast two different Spyware/Malware scanners. Here is a list of the best.