Malwarebytes - Malwarebytes protects you against malware, ransomware, and other advanced online threats that have made antivirus obsolete and ineffective. Free Anti-Malware & Malware .
Avira - Cloud based email security solution
NoDistribute - NoDistribute is an online tool that lets you scan files for viruses without any result distribution.
Microsoft Security Essentials - Microsoft Security Essentials is Microsoft's own foray into the world of virus protection.
ComboFix - Combofix is a free anti-malware program developed by sUBs for Windows computers
Windows Defender - Windows 10 security delivers built-in & ongoing protections you can trust: Windows Defender Antivirus, firewall, family settings, ransomware protection, real-time protection & more. Stay up to date & protected at no extra cost.