I’ve tried several security softwares before, paid version and free version such as zoneAlarm, avast, avg, panda, norton, mcafee and so on. Some products are really great and i’m using it until now. I STRONGLY recommend these programs below because i’m very satisfy with their works and the programs’ qualities.
ZoneAlarm firewall

ZoneAlarm is designed to protect your DSL- or cable-connected PC from hackers. This program includes four interlocking security services: a firewall, an application control, an Internet lock, and Zones. The firewall controls the door to your computer and allows only traffic you understand and initiate. The Internet lock blocks Internet traffic while your computer is unattended or while you’re not using the Internet, and it can be activated automatically with your computer’s screensaver or after a set period of inactivity. Zones monitor all activity on your computer and alert you when a new application attempts to access the Internet. Version 7.0.362 may include unspecified updates, enhancements, or bug fixes.
————————————————————————————————————————-
In my opinion, ZoneAlarm firewall for windows XP is the best free firewall. ZoneAlarm is a must-have for any home user who doesn’t want to buy expensive (and sometimes ineffective) commercial software. It’s very easy to use and I don’t see that it uses much in the way of system resources. Possible intrusion alerts are well presented. It has prevented hundreds of intrusions since I started using it. ZoneAlarm firewall blocks every attempt to access your computer over the internet, whether inbound or out. ZoneAlarm is an excellent firewall choice for just about any average user.
Download free ZoneAlarm firewall
AVG Anti-virus free edition

AVG Free Edition is the well-known antivirus protection tool. AVG Free is available free of charge to home users for the life of the product. Rapid virus database updates are available for the lifetime of the product, thereby providing the high level of detection capability that millions of users around the world trust to protect their computers. AVG Free is easy to use and will not slow your system down (low system resource requirements. Highlights include automatic update functionality, the AVG Resident Shield, which provides real-time protection as files are opened and programs are run, free Virus Database Updates for the lifetime of the product, and AVG Virus Vault for safe handling of infected files.
————————————————————————————————
AVG Anti-Virus Free Edition is the best free anti-virus program out there. It comes with daily free updates, automatic scans, e-mail scanner and even real-time protection that alerts you when something is infected. It has kept my computer free from viruses, is regularly updated, and does not intrude on my other uses of the computer. An excellent anti-virus from Grisoft.
Download AVG Anti-virus free edition
CCleaner

CCleaner is a system optimization and privacy tool. It removes unused files from your system – allowing Windows to run faster and freeing up valuable hard disk space. It cleans: Internet Explorer (Temporary files, URL history, cookies, Autocomplete form history, index.dat); Firefox (Temporary files, URL history, cookies, download history); Windows (Recycle Bin, Recent Documents, Temporary files, and Log files); Registry cleaner (Advanced features to remove unused and old entries, including File Extensions, ActiveX Controls, ClassIDs, ProgIDs, Uninstallers, Shared DLLs, Fonts, Help Files, Application Paths, Icons, and Invalid Shortcuts. So comes with a comprehensive backup feature.)
—————————————————————————————————————–
I highly recommend this free cleaning tool. Its easy to use and user friendly. CCleaner is much faster than any other programs. It does work at cleaning unwanted files. It knows what to and to not clean. If unsure about deleting anything, this has a back up option for you to save items to be deleted.
Download free CCleaner
Avast Home Edition

Avast Home Edition is a complete ICSA & Checkmark certified antivirus. Avast includes the following components: On demand scanner with skinnable simple interface, just select what do you want to scan in which way and press the Play button; On access scanner, special providers to protect the most of available e-mail clients; Instant messaging–ICQ, Miranda; Network traffic–intrusion detection, lightweight firewall; P2P protection for Kazaa, BitTorrent; Web shield–monitors and filter all HTTP traffic; NNTP scanner–scans all Usenet Newsgroup traffic and all operations with files on PC; Boot time scanner–scans disks in the same way and in the same time as Windows CHKDSK does.
—————————————————————————————————————
Another best antivirus, Avast is simple and friendly user interface. It’s much less consuming of system resources and it never slow down your computer. The scanning and removal processes are great, updates work perfectly , and the greatest part is the cool interface. With daily virus database updates and real time monitoring, Avast is the perfect solution for home users. For a normal home user, i STRONGLY recommend this.