NetDefender
NetDefender is a Free Firewall with source code, which can be downloaded along with firewall executables. Netdefender works on windows 2000 and windows XP.
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Spybot - Search & Destroy
Search your Windows 7's hard disk and Registry for threats to your security and privacy. More | Download
Avast! Free AntiVirus
Protect your PC against the latest viruses and spyware.
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