System Shield 3 Internet Security - up to 3 PCs iolo AntiVirus to block viruses, malware, rootkits, and other dangerous programs. iolo Personal Firewall to stop hackers and other external attacks. Spython AntiSpyware to eradicate spyware, adware, keyloggers, and other parasites. System Guard to monitor and stop malicious programs from changing system settings or damaging core operating system files. Security Optimizer to comprehensively scan for and repair dangerous and potentially hidden security vulnerabilities on your PC.