System Shield integrates all the tools you need to keep your PC safe on the Internet. This all-in-one security suite includes: iolo AntiVirus to detect and block viruses, iolo Personal Firewall to monitor suspicious communication, the Spython spyware remover to eradicate spyware, System Guard to stop malicious software from changing system settings, and a Security Optimizer to repair security flaws. 1 license can be installed on up to 3 machines.