Freeware Security Software

AVG Anti-Virus
Trusted by 70 million users, we find this anti-virus solution to be more than adaquate, especially when combined with CCleaner and Ad-Aware. This is the most downloaded software on CNET's Download.com. Compatible with Windows Vista and Windows XP.

CCleaner
CCleaner is a system optimization, privacy and cleaning tool. It removes unused files from your system - allowing Windows to run faster and freeing up valuable hard disk space. It also cleans traces of your online activities such as your Internet history. Additionally it contains a fully featured registry cleaner. And it's fast and contains NO Spyware or Adware!

Ad-Aware 2008 Free
Ad-Aware 2008 is the latest version of Lavasoft's industry leading anti-spyware solution. Ad-Aware 2008 protects you from spyware and malware that secretly takes control of your computer, resulting in aggressive advertising pop-ups, sluggish computer activity and even identity theft through stolen private information.

ThreatFire
Rather than search for known computer threats like traditional antivirus programs, ThreatFire utilizes behavior analysis. It continually analyzes programs and identifies unusual activities, and will reject viruses from infecting your computer.