Microsoft free antivirus software: SCEP and MSE

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New features of SCEP 4.4 include: enhanced self-protection, greatly accelerated performance (scanning speed), enhancements to Microsoft Active Protection Service and Dynamic Signature Service, and comprehensive improvements to cloud-based protection.
Download: Forefront Endpoint Protection official version 4.4.304, multi-language X86+X64 version download 2.
Microsoft Security Essentials is a Microsoft security protection software that can be used free of charge on genuine Windows computers, helping you stay away from the threats of viruses and malware.
Download: Microsoft official download