Many organizations have deployed antivirus , malicious software such as computer viruses, worms, and Trojan horses. But below are the most popular and best Antivirus and Internet security . This article will help you to define the good antivirus for your PC. There are many choices of antivirus software most of which do a good job at protecting you from virus threats if you regularly scan your computer and update daily then your PC will be great work.
Below are some top class antivirus software in the market.
1- Microsoft Security Essentials:
Microsoft Security Essentials is a Best and totally Freeware antivirus develop by Microsoft Corporation,Founded in September 2009.It as available in English, Bulgarian, Chinese (Simplified), Chinese (Traditional), Czech, Danish, Dutch, Finnish, French, German, Greek, Hungarian, Italian, Japanese, Korean, Norwegian, Polish, Portuguese (Brazilian), Portuguese (Portugal), Romanian, Russian, Swedish, Slovakian, Spanish, Thai, Turkish and Ukrainian languages.Microsoft Security Essentials requires operating system is Windows XP with Service Pack 2 (32-bit)
Windows Vista and Windows 7 (32- and 64-bit) Website
2- Kaspersky Internet security:
Kaspersky is a leading provider of Internet security for consumers and businesses worldwide.Founded in Moscow, Russia (1997).Its founder is Eugene Kaspersky.Kaspersky is headquartered in Moscow,Russia and served Worldwide Area.Its products are Kaspersky Anti-Virus,Kaspersky Internet Security,Kaspersky Mobile Security,Kaspersky PURE,Kaspersky Open Space Security,Integrated security.
Kaspersky Anti-Virus protects your computer against known and unknown threats, and against unwanted data. Besides, it monitors system activities by user applications, preventing any dangerous actions by applications.Kaspersky Anti-Virus 2011 requires Windows XP and Windows Vista. Website
3- Avast Internet security:
Avast Internet security is a powerful antivirus in the world i recomend you to use this free antivirus or internet security ,because it is my favorite and i am using personaly.Avast does just about everything you could ever need a security app to do.Its Web Shield is an excessively simple tool, controlled by just one check box, which actively protects users from online threats including phishing websites, malware, etc. Avast Internet security smoothly run in all mictosoft windows. Website
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4- ESET NOD32 Antivirus
ESET NOD32 Antivirus proactively detects and disables 
viruses,Trojans,worms,adware,spyware,phishing,rootkits.It includes advanced archive scanning,access control for removable media.ESET NOD32 Antivirus is supported by Windows XP 32-bit, Windows Vista 32-bit, Windows 2000,Mac OS X, Linux, FreeBSD, DOS, Novell NetWare, Solaris, Windows Mobile. Website
5- BitDefender:
BitDefender is an easy on system resources and the wallet for complete protection.Founded in 2001 and Founders are Florin and Mariuca Talpes.BitDefender is headquartered in Bucharest, Romania.Its products are Bitdefender Antivirus Pro 2011, BitDefender Internet Security 2011, BitDefender Total Security 2011. Website
6- Webroot AntiVirus:
Webroot is a best Internet security for consumers and businesses worldwide. Founded in 1997, privately held Webroot is headquartered in Boulder, Colorado, USA. Webroot’s products include Spy Sweeper,Webroot Window Washer,Webroot Internet Security Essentials,Webroot AntiVirus with AntiSpyware,Webroot Desktop Firewall give privacy and identity protection for consumers. Website
7- Norton AntiVirus:
Norton Anti Virus 2011 provides fast, responsive defense against all types of malicious software.The new Norton Protection System employs a multilayer-ed set of security technologies that work in concert to detect, identify, and block attacks.It is still the top of its class in terms of performance.Norton Anti Virus requires operating system is Microsoft Windows (Microsoft Windows 7, Windows Vista, and Windows XP), Mac OS X.Website
8- AVG AntiVirus:
AVG has become a bigger name in recent years due to its hugely successful freeware.It’s a complete solution that includes a link scanner and “surf shield.Developer’s AVG Technologies, s.r.o.AVG requires operating system is Microsoft Windows, Linux, FreeBSD
Website
