Spybot - Search & Destroy - Spybot Search & Destroy is an anti-malware, adware and antivirus program for safe removal of the threats from the PC and browser.
Avira Internet Security - Avira Internet Security Suite is a one-size-fits-all security solution for your online life.
ComboFix - Combofix is a free anti-malware program developed by sUBs for Windows computers
COMODO Internet Security - Download Free Internet Security Software for Complete protection against viruses and attacks of your computers. Know what's new in Comodo Internet Security.
Malwarebytes - Malwarebytes protects you against malware, ransomware, and other advanced online threats that have made antivirus obsolete and ineffective. Free Anti-Malware & Malware .
ESET Smart Security - A Great time online with even better technology!