Free virus protection and optimization
A free and safe companion: Avast Free Antivirus
Free and comprehensive protection suite
Free and simple antivirus software from Microsoft
Bitdefender Internet Security 2018
Complete protection for your PC
FingerPrint
A free Security program for Windows
Folder Password Lock Pro
Software for Enhanced Folder Protection and Privacy
IObit Malware Fighter
Free anti-malware & antivirus specialized in ransomware