Here are the download pages & help page for Comodo Internet Security and Comodo Firewall.
https://www.comodo.com/products/free-products.php
https://help.comodo.com/topic-72-1-451-4692-Installing-Comodo-Internet-Security-2013-Complete.html
Comodo Internet Security, Network protection that allows you to stay safe on the internet.
Secures all connections when you are online
Prevents all viruses and online threats
Provides fast cloud-based scanning
Improves your PC performance and efficiency
Antivirus: Tracks down and destroy any existing malware hiding in a PC.
Anti-Spyware: Detects spyware threats and destroys each infection.
Anti-Rootkit: Scans, detects & removes rootkits on your computer.
Bot Protection: Prevents malicious software turning your PC into a zombie.
Defense+: Protects critical system files and blocks malware before it installs.
Auto Sandbox Technology™: Runs unknown files in an isolated environment where they can cause no damage.
Memory Firewall: Cutting-edge protection against sophisticated buffer overflow attacks.
Anti-Malware Kills malicious processes before they can do harm.
https://www.comodo.com/home/internet-security/free-internet-security.php
Just follow this guide in this video on setting up and configuring your free Comodo Internet Security and Comodo Firewall and Anti-virus software product.
