Are Microsoft Security Essentials plus Windows defender a safe protection against malware like Smart Fortress and Security Shild. Is it an alternativ to McAfee and Malwarebytes Anti-Malware?
MSE is another antivirus and I doubt it defends against such things, no antiviruses do and running 2 antivirus applications can actually open the machine to infection as they can clash.
Windows Defender and Malwarebytes free version are OK but I don't know if they defend against this but at least the latter can remove it I believe.
Smart Fortress needs special treatment as here: http://forums.malwarebytes.org/index.php?showtopic=107384