2. Ad-Aware Free Antivirus +11

Ad-Aware Free Antivirus +11 is a great antivirus program. It quarantines viruses as it finds them instead of waiting until the end of the scan. Also, if you need it, it has free remote malware remediation. This is an updated version of Ad-Aware, and while it is not quite as good at detecting malware, it is still a great free option.