AVG Anti-Virus plus Firewall Edition is the ideal product to protect your single home PC or workstation from external threats such as viruses, the internet, or other network users.
It is simple to install and operate. No IT expertise is required and it can run in the background, providing uninterrupted protection. All unauthorized network activity is blocked automatically, allowing you to get on with your work without worrying about external attacks.
All file and e-mail activity is continually scanned to eliminate the threat of viruses.
It is extremely fast, reliable and light on resources, so, no matter how demanding a user you are, it will not slow down your performance. ... more

This update addresses an issue that could cause your system to stop responding if certain firewall or antivirus programs are installed. You can help resolve this issue by installing this HTTP.sys update from Microsoft. After you install this item, you may have to restart your computer.Download:

Update for Windows XP SP2 (KB887742) ... more

ZoneAlarm protects your sensitive personal and financial data from hacker attacks. It keeps your private information safe from the outside world, and can even track the source of intrusion attempts and map their whereabouts instantly, without exposing your identity or location. ... more

The most full-featured Internet power tool on the market, Opera includes pop-up blocking, tabbed browsing, integrated searches, and advanced functions like Opera's groundbreaking E-mail program, RSS Newsfeeds and IRC chat. And because we know that our users have different needs, you can customize the look and content of your Opera browser with a few clicks of the mouse.
Changelog
Added Core version (currently "Presto/2.1.1") to the User-Agent header; all our products will include this feature soon
Sites using HTTP Auth are now saved in typed history
Added setting to prevent bookmarks from showing in the Address field auto-completion drop ... more