Microsoft Security Essentials v4.0

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Download: Windows Vista & 7 (32-bit) / Windows Vista & 7 (64-bit) / Windows XP

 

This service update contains product enhancements to improve performance and user experience. We have improved on Microsoft Security Essentials’ Automatic Remediation, which will automatically quarantine highly harmful threats without prompting the user to take action as well as minor bug fixes in setup, malware remediation and other areas. (Source)

 

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