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Here is a list of best and free anti-virus software available for Windows Platform:-

1. AVG antivirus FREE (CLICK HERE TO DOWNLOAD)
   One of the best anti-virus software available.

   It has a 5 star rating in Cnet Download.com and 226,636,250 Total number of downloads.

   It averages 1.5 million downloads every week on download.com alone.

   Certainly the most popular anti-virus software. Having used it personally both at my home computer and at work (where we had important client data), i have seen that this software is very reliable (even better than many other commercial software out there)

2. AVAST free (DOWNLOAD)
   The second best in the list. 

   Avast is the next best alternative to the most popular AVG. People reportedly use Avast more as compared to AVG when they need an Anti-virus that is lighter on system resources.

   It is however not as great as AVG to catch the virus and malware.

3. Clam AntiVirus (DOWNLOAD)
   Clam is not as popular as AVG or Avast but it has the potential to reach the top list.

   It is an open source (just like Firefox!) with open source community working towards its development and improvements.

   You may consider giving it a try if you are looking for a completely free alternative to commercial software.

4. Panda Cloud Antivirus (DOWNLOAD)
   Another great free antivirus software available on the internet. Download it and start using this efficient virus removal tool.

   There are various versions available on the official website especially for netbooks and other based on feature set.

5. PC Tools AntiVirus Free Edition (DOWNLOAD)
   PC tool is the company that provides various tools to improve system productivity and optimize the Windows system.

   They have launched anti-virus software which specialize in email and internet files scanning.

6. BitDefender Free Edition (DOWNLOAD)
   This is the latest version of this free software.It is reportedly one of the fastest one as compared to other free software in the list.

Also read:

WAIT! Do not download an anti-virus software before you read this

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