Free Security & System Software

FREE SECURITY SYSTEM SOFTWARE

Comodo Internet Security 3.5
If you're looking for an all-in-one security solution, Comodo's new suite is ideal. It offers firewall, anti-malware and anti-virus protection from within one interface. The firewall gives you complete control over which programs can and can’t access the internet as well as preventing external attacks, while the anti-virus element provides real-time and on-demand scanning.
Minimum requirements: Windows XP/Vista
File size: 24.6MB
Download:Comodo Internet Security 3.5

Secunia PSI 1.0
According to Secunia, 98 per cent of all PCs have at least one or more insecure program installed on them. The company’s Personal Software Inspector scans your system looking for any old and outdated Programs and then provides a handy direct download link to any newer versions or patches.
The latest version introduces an optional simple interface (aimed at less technical users) which only displays insecure software that can be easily patched.
Minimum requirements:Windows XP/Vista
File size: 520KB
Download: Secunia PSI 1.0

Advanced SystemCare Free 3.0.1
Formally known as Advanced WindowsCare Personal, this all-in-one system suite can eliminate all manner of problems automatically, including removing spyware, fixing Registry problems, erasing all trace of your activity (online and off) and cleaning up left-over junk files. It can diagnose problems, defrag your hard disk and speed up your PC, and comes with loads of additional tools for tuning, securing and managing your system.
Minimum requirements: Windows XP/Vista
File size: 7.2MB
Download: Advanced SystemCare Free 3.0.1

AVG Free 8
The popular anti-virus toolkit has had an interface makeover, combining the previously separate Test Centre and Control Centre modules into a single easy-to-use front end.It offers real-time and on-demand protection from both viruses and spyware, and an optional security toolbar that can protect you from rogue websites and phishing scams.
Minimum requirements: Windows XP/Vista
File size:45.6MB
Download: AVG Free 8

Trend Micro Web Protection Add-On 1.2
Designed to bolster your existing security software rather than replace it, this add-on provides an additional layer of real-time protection, monitoring all HTTP requests and alerting you if any web threats or bot-related activity is detected. In the event of a problem you’ll be directed to Trend Micro HouseCall for a full system scan and clean. It’s available as a 90-day free trial, although there’s no paid version to upgrade to yet.
Minimum requirements: Windows XP/Vista
File size: 8.3MB
Download: Trend Micro Web Protection Add-On 1.2

CCleaner 2.14
A must-have system cleaner, this tool removes temporary files, cached web pages and general junk from your computer. You can add a Run/Open CCleaner option to the Recycle Bin, and set the software to securely delete unwanted files (though this takes a little longer to complete).
It also offers a gentle Registry cleaner, uninstaller and cookie manager.
Minimum requirements: Windows XP/Vista
File size: 2.8MB
Download: CCleaner 2.14 

Paragon Drive Backup 9.0 Express
This speedy and easy-to-use back-up tool lets you create an exact copy of your PC including the operating system, applications, user settings and all data. This allows you to recover your entire hard disk in minutes after a virus or drive failure. You can also restore your computer to an earlier state without losing data and create a bootable USB flash drive.
Minimum requirements:Windows XP/Vista
File size: 71.8MB
Download: Paragon Drive Backup 9.0 Express

Malwarebytes’ Anti-Malware 1.31
Designed to combat spyware and malware threats such as Trojans and browser-hijacking software, this is a fast and impressively thorough security tool. It uses advanced heuristic scanning technology to find and remove threats that other similar software misses.
You can run quick or full scans, and upgrade to the paid edition for real-time protection.
Minimum requirements: Windows XP/Vista
File size: 2.42MB

Download: Malwarebytes’ Anti-Malware 1.31