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Firewall software  is a software that prevents unauthorized users from accessing a private network that is connected to a public network.That is it protects networked computers from intentional hostile intrusion .It examines all traffic routed between the  networks to identify if it meets certain criteria. If it does, it is routed between the networks, otherwise it is stopped.It  filters both inbound and outbound traffic. The top firewall softwares are listed below.

1.PC Tools Firewall Plus Free Edition 3.0.36

URL :http://www.download.com/PC-Tools-Firewall-Plus-Free-Edition/3000-10435_4-10625321.html

PC Tools Firewall Plus Free Edition is a powerful personal free firewall for Microsoft Windows.It protects your computer from hackers and intruders. It control the network traffic in and out of our PC by monitoring applications that connect to the network. It can prevent Trojans, backdoors, and keyloggers from damaging our computer .Powerful prevention against attacks and known exploits is activated by default and advanced users . The program is recommended for use  of antispyware and antivirus software like AVG or Spyware Doctor to protect PC against Spyware, hackers, worms, and viruses.This version adds new smart application rules, Stealth Mode protection, and data validation using SPI.

2.ZoneAlarm Anti-Spyware 7.1

URL :http://review.zdnet.com/security-encryption/zonealarm-anti-spyware-7/4505-3688_16-32784960.html

ZoneAlarm Anti-Spyware provides instant protection against hackers and spyware. It includes  triple-layer personal firewall.It delivers proactive firewall protection with multiple layers of security that stop inbound, outbound, and program attacks while remaining completely invisible to hackers. It protects our Windows operating system from attacks all the way down to its core.It also scans for and removes thousands of spyware traces from our computer.It provides real-time security updates and new attack protection capabilities.It is one of the least expensive paid software.

3.Prisma Firewall

URL :http://www.prismafirewall.com/

Prisma Firewall is designed for home and small office settings. This software provides a reliable solution to intrusion prevention, a personal firewall for individual PCs. Thus it helps in preserving the confidential and the integrity of the data in private computers or company computers, every person or company needs a firewall. Most of these software programs are made with complex interface and design.   It is created and developed especially for home users and small business users. It is easy to install, to learns and use.It offers the following advantages such as filtering network traffic, allowing the access of only required information, the blocking of attacks,offering stealth protection for the user on the Internet, so that it can’t be detected and attacked, the control of the applications network access, sending messages and alert signals when the computer is being attacked.

4.NeT Firewall 3.0.23

URL :http://www.ntkernel.com/w&p.php?id=18

NeT Firewall is comprehensive firewall.It is built to protect Windows-based systems not currently protected by a firewall. Inspection technology tracks each packet traversing the firewall and makes sure that they are legitimate. It also monitors the state of the connection and compiles the information in a state table ensuring that the source and destination of each packet is valid.It improves network security policy.It is more secure than application-based personal firewalls, yet less expensive than high-end firewalls.

5.Comodo Firewall Pro 3.0.22.349

URL :http://www.download.com/Comodo-Firewall-Pro/3000-10435_4-10460704.html

Comodo Firewall Pro is aimed to secure our system against internal attacks such as Trojan viruses or malicious software and external attacks by hackers. .It helps to connect in a secure way to the internet and global networks.It may include unspecified updates, enhancements, or bug fixes.The program still provides information and options for advanced usersat the same time it is  simple enough for beginners . The most obvious new features is that it offers support for Windows Vista at the expense of Windows 2000 support, although the older v2.4 with Windows 2000 support is still available.

6.The Shield Pro 2005

URL :http://www.download3000.com/download_9172.html

The Shield Pro 2005 provides  protection from viruses, hackers, and privacy threats.  It is powerful yet easy to use and protect  our PC . It gives updates  for one year and it also gives us all the free technical support that need to successfully protect .This software using Hauri technology for virus protection.Hence it accurately detects and repairs viruses with its fully optimized and separated antivirus engine for Macro, Script and Windows viruses. It is distinguished from the other antivirus tools by its high-speed scanning capability. It also scans and cleans email messages on a real time basis before they ever reach our computer.

7.Zone alarm Pro 7.0.462

URL :http://www.download.com/ZoneAlarm-Pro/3000-10435_4-10061193.html

ZoneAlarm Pro 7 augments our existing Antivirus solutions. It adds powerful, multi-layered security and additional protection.  It includes operating system firewall, network and program firewall, anti-spyware, identity theft protection. This version may include unspecified updates, enhancements, or bug fixes. It’s wizard makes firewall configuration and maintenances incredibly easy, with a stylish interface and simple slider controls.It’s feature allows us to assign different security levels for local networks and the Internet. The program was very good at automatically including our local network settings and auto-detected wireless machines. It is one of the strongest firewall ever.

8.Windows Live OneCare

URL :http://onecare.live.com/standard/en-us/default.htm?mkt=en-us&s_cid=WL2Hdr

Windows Live One Care helps keep our PC safe from viruses, spyware, and other threats. This  is  an all-in-one software always-on PC care service from Microsoft works continuously, automatically, and quietly in the background to keep our valuable files protected and our PCs virus-free and working their best.The new version includes multi-PC and home network management, printer sharing support, start time optimizer, proactive fixes and recommendations, WiFi security, centralized backup, and online photo backup

9.Panda Antivirus + Firewall 2008 7.01

URL :http://www.download.com/Panda-Antivirus-Firewall-2008/3000-2239_4-10062122.html

Panda Antivirus + Firewall 2008 offers permanent and automatic protection for our PC against all types of viruses and spyware. This incredibly light and easy to use solution. It has no rivals as a straightforward and  it is an affordable computer security tool.It is easy to use, simplicity and extremely low resource consumption.This make it the ideal protection program for our computer and one that we can truly install and forget.This version may include unspecified updates, enhancements, or bug fixes.

10.McAfee Personal Firewall Plus 6.0

URL :http://www.amazon.com/McAfee-Personal-Firewall-Plus-Version/dp/B000A9QUS2

McAfee Personal Firewall Plus 2005 is a useful firewall software for absolute beginners. It will frustrate advanced users. It is famous for its quick installation,attractive interface,security out of the box.It’s features are proven PC security that helps prevent hacker attacks, safeguards financial documents, personal info, photos, and more,prevents unwanted Internet connections to or from PC,integrates seamlessly with McAfee Virus scan virus detection and removal,updates automatically to protect against new threats.Proven security that helps prevent hacker attacks.