What is a Virus:

Virus (Vital Information Retrieved Under Seized) is a harmful program which are written by people (who wish to gain control of your system resources and are continually updated to try and break through any barriers you may have installed.)  perform different destructive functions. It may destroy programs and data .

Common Virus Infection Symptoms are

• Unexplained printing problems occur
• Operating System software appears to be modified
• The Keyboard does not work properly
• An entire disk or drive is erased
• Specific files are mysteriously deleted
• Unexplained messages appear on the screen
• Application software seems to be changed

The best way to detect virus is to use anti-virus software.

About Antivirus

Antivirus software  is designed to detect, prevent and removing malicious software like viruses, malware, worms, trojans etc., A virus signature is based on unique segment of code within the malware, typically checksummed/hashed and distributed in the form of antivirus signature updates.

The most popular Antivirus softwares and their link are listed below  (download always latest versions).

Freeware:

Name	Description
Avast Antivirus	avast! Free Antivirus is the best virus and spyware protection available. Download the world's most popular antivirus software completely free. Official link www.avast.com External Link http://filehippo.com/download_avast_antivirus/ http://www.avast.com/index
AVG Antivirus	Free antivirus and anti-spyware security software for Windows. Get free antivirus protection now! Official link www.avg.com External link http://filehippo.com/download_avg_antivirus_32/
Avira Antivirus	Avira offers best free antivirus protection against dangerous viruses, worms, Trojans and spyware Official link www.avira.com External link http://filehippo.com/download_antivir/

Premium Software

Symantec Endpoint Protection (Enterprise Edition)	Symantec Endpoint Protection is the fastest, most powerful endpoint security software solution. It provides state-of-the-art protection against all types of attacks through its network, file, reputation and behavior layers of defense. Symantec Insight makes scanning smarter resulting in dramatically better endpoint security performance. Endpoint Protection can integrate with VMware vShield Endpoint in virtual environments providing maximum performance without sacrificing security. Endpoint Protection seamlessly combines the essential endpoint security tools you need into a single, high performance agent with a single management console. Official link www.symantec.com http://store.symantec.com/ External link http://www.softpedia.com/get/Antivirus/Symantec-Endpoint-Protection.shtml http://download.cnet.com/Symantec-Endpoint-Protection/3000-2239_4-75133536.html
Norton by Symantec	Protect your small, medium or enterprise business with the latest security solutions from Symantec. Official link http://in.norton.com/antivirus/ External link http://in.norton.com/downloads/ http://www.softpedia.com/dyn-postdownload.php?p=4338&t=0&i=1
Kaspersky Internet Security	Kaspersky Lab is one of the fastest growing IT security vendors worldwide. Today it is firmly positioned as one of the world’s top four leading antivirus vendors*. Kaspersky Lab continues to further improve its market position, demonstrating higher growth rates than the market in general. According to the company’s 2011 unaudited financial results, Kaspersky Lab’s global revenue grew by 14% compared to the previous year and reached $612 million. Today it’s the world’s largest privately held vendor of endpoint protection solutions. Official link http://www.kaspersky.com/ External link http://www.kaspersky.com/trials http://www.softpedia.com/get/Antivirus/Kaspersky-Antivirus-Personal.shtml http://www.filehippo.com/download_kaspersky_antivir/ http://www.soft82.com/download/windows/kaspersky-anti-virus/
ESEC NOD32	ESET NOD32 Antivirus is the most effective protection you can find to combat today's huge volumes of Internet and email threats. It provides comprehensive antivirus and antispyware protection without affecting your computer's performance. official link www.eset.com http://www.esetindia.com/shop/home/ External link http://www.esetindia.com/shop/home/ http://www.filehippo.com/download_nod32/
Alwil Avast Professional Edition	Full-featured antivirus software with advanced virtualization technology. Any application can be run in the virtual desktop avast! Safezone. Official link www.avast.com External link http://www.avast.com/pro-antivirus http://www.softpedia.com/get/Antivirus/Avast-Professional-Edition.shtml

Other popular Antivirus for Home

Bit Defender  Antivirus	Award-winning antivirus software from Bitdefender. Get the best real-time security for your PC with our advanced software. Official link www.bitdefender.com http://www.bitdefender.com/Downloads/
Panda Antivirus	Harness the power of the cloud and help automatically improve the protection of every computer in the Panda community. Protect yourself from all kinds of online threats: viruses, hackers, online fraud, identity theft and all other known and unknown malware. Panda Global Protection Panda Internet Security Panda Antivirus Pro Official link www.pandasecurity.com http://www.pandasecurity.com/homeusers/downloads/ External link http://www.softpedia.com/get/Antivirus/Panda-Antivirus-Titanium.shtml http://www.scanwith.com/download/Panda_Antivirus_Pro.htm
Trend Micro	Trend Micro™ Titanium™ Antivirus+ provides easy-to-use security for the tasks you do every day—email, socialize, and surf the web, hassle free. It features: Antivirus and Antispyware, Antispam ,Security ,Social Networking,Windows 8 Secure Browser ,Fully compatible with Microsoft windows 8,Facebook Privacy Scanner Official link www.trendmicro.com http://downloadcenter.trendmicro.com/?regs=APAC
McAfee Virus scan	McAfee VirusScan Enterprise combines anti-virus, anti-spyware, firewall, and intrusion prevention technologies to stop and remove malicious software. Official link www.mcafee.com http://apac.trendmicro.com/apac/products/sb/ http://home.mcafee.com/downloads/free-virus-scan?ctst=1 External link http://www.filehippo.com/download_mcafee_virusscan/ http://mcafee-total-protection.en.softonic.com/
F-secure	F-Secure Internet Security is antivirus software that protects your computer against viruses and other malware and lets you browse the web safely. Official link www.f-secure.com http://www.f-secure.com/en/web/business_global/support/downloads External link http://www.scanwith.com/download/F-Secure_Anti-Virus.htm http://www.softpedia.com/get/Antivirus/F-Secure-Internet-Security.shtml

Latest versions of Antivirus:

Symantec Endpoint Protection Small Business Edition, Bitdefender Antivirus Plus 2013,Bitdefender Internet Security 2013, Bitdefender Antivirus for Mac, Bitdefender Sphere 2013, Bitdefender Total Security 2013, ESET Smart Security, ESET NOD32 Antivirus, ESET Cybersecurity, ESET Nod32 Antivirus for linux Desktop, ESET Mobile Security,Panda Antivirus 2013, Panda Internet Security 2013, Panda Global Protection 2013,Avast Antivirus 7.0.1466, Kaspersky Antivirus 2013.13.0.1.4190, AVG Antivirus 2012, F-Secure Anti-virus 2013, McAfee Total Protection 2013 , Trend Micro Antivirus plus Antispyware, Trend Micro Titanium Internet Security 2011, Trend micro Worry-Free Business Security, Trend micro  Worry-Free Standard Edition