Antivirus products and personal firewalls are not a drop in solution for a secure host/system. Malware can often stay undetected and evade scans, while application level personal firewalls are often circumvented. Polymorphic code and rootkits essentially render antivirus products helpless. In the case of sophisticated and targeted attacks, the antivirus software can serve as a pathway to exploiting a system's kernel, since they almost always run with administration level privileges. Antivirus software also harms privacy by sending system files back to the company servers for analysis. The software also actively conducts man-in-the-middle attacks on secure SSL connections, enabling very sensitive information to be viewed.

Anti Virus software comparison chart.

Cyber Attack Map (Kaspersky).

Cyber Attack Map (Norse).

AV comparison.