Top Antivirus free for Windows Operating system is most widely Used by many User,it was originally designed easy to use by any newbie User .Windows is simple to learn and have great performance specially SP3 . Since Windows can’t provide total security for your network and data we have to use some additional program to protect our file and system from most dangerous Viruses, Malwares and Worms. Windows has Firewall to protect our Network Data.There are lot’s of freeware anti-virus software which can protect your computer for Virus.
Microsoft Security Essentials
Microsoft Security Essentials is used to guard against viruses, spyware and Worms. It gives real time protection for home or Small business PC. Microsoft Security Essentials is free software from Microsoft, get automatic update and easy to use. 
[Download Microsoft Security Essentials ]
AVG Anti-Virus
AVG Anti-Virus Free Edition 2012 is one of the most famous free antivirus software that is available for free download. Automatic update functionality, real-time protection, e-mail protection, free virus database updates and automatically delete virus are some the cool features of AVG Anti-Virus.
[Download AVG Anti-Virus]
Avast Antivirus
Avast Antivirus 2012 is an excellent antivirus that works in Windows operating system like Windows 7 ,Windows XP and other Windows Update. Avast Antivirus comes with package which can protect all kinds of viruses ,Malwares and Harmful website. Avast Antivirus loaded with features like full real-time capabilities, including web, e-mail, IM, P2P and network shields and boot-time scanning . Boot-time scanning is one of best feature in Avast which scans from boot and ask for actions like delete or repair etc.
[Download Avast Antivirus]
Kaspersky Anti-Virus 2012
Kaspersky is most effective software that gets updated regularly,get automatically scanning for files, detect unwanted objects and remove it. Kaspersky also enable users to control components of software and also adjust security level of Anti-Virus.
[Download Kaspersky Anti-Virus]
BitDefender Total Security 2012
BitDefender Total Security 2012 offers total protection against all internet security threats.BitDefender boost performance, protect against all viruses and spyware .
[Download BitDefender Total Security ]
Avira AntiVir Professional
Avira AntiVir Professional protects data from malware,spyware, worms, adware, rootkits and scripts detection.Avira comes with inbuilt Email scanner which scans harmful mails and also Enhancing the security and performance. 
[Download Avira AntiVir Professional]
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