Windows XP SP3 Avast Free 10.4.2233; Agnitum Outpost Firewall Pro 9.3 (maximum security settings + HIPS): Malwarebytes Anti-Exploit 18.104.22.168; NoVirusThanks OSArmor 1.4.3 (all settings enabled including Advanced); Comodo Memory Firewall 22.214.171.124; MVPS Hosts file; OpenDNS. The above all play nice together. Frequent scans by SuperAntiSpyware, Avast and Malwarebytes Antimalware on-demand scan almost never report evidence of malware. Internet router uses Stateful Inspection. Gibson Research ShieldsUp!! confirms full stealth and no UPNP. With so few updates after End-of-Life, security software like Outpost and OSArmor can be set to the max. I do not use this system for online banking and purchasing or any other privacy/confidentiality sensitive purposes.