Which Anti virus is free and nice

Best Free Antivirus Software

Also on Gizmo's site it's good to read the comments. Some are just people touting their favorite. But now and then you may find a real gem not mentioned in the article.

Many many good ones to choose from. Follow the links posted or just search "free anti-virus", then read the reviews. Major Geeks is a good place as is Softpedia.

Kingsoft antivirus 2012 and it is totally free- it is a cloud based antivirus program
Very light on resources, can run alongside almost any other antivirus program except Windows Defender in 8

Here's a free open source one ClamWin

It's a scanner, not real-time protection.

Just remember, the best AV will not help you if you don't employ common sense. If something looks suspicious or too good to be true, either research it or ignore it. No AV is 100% and the final decision comes down to you on what you use. Keep your AV defs updated as new variants of viruses are released every day.

You can download either Avast free antivirus or Microsoft Security essentials .
Both have good detection rates and are well trusted .
Here's the link you have asked for -

avast! version 7 - avast! Free Antivirus | Download Antivirus Protection Software

Microsoft Security Essentials - Microsoft Security Essentials - Microsoft Windows