KIS is the one of the best Anti-virus software that provide full protection for your PC.Kaspersky Internet Security 2011 Secures your PC or Netbook being slowed down by cybercriminals and delivers unsurpassed on-line safety whilst protecting your files, music and photos from hackers.here is one which can easily provide you a Free 3 months license of the powerful Kaspersky Internet Security 2012 (KIS 2012).

Follow this step by step guide to redeem your 90 day free subscription:

1.The 90 days trial license of KIS 2012 is being offered by Kaspersky Labs Germany at their Facebook fan page. To grab the license, you don’t need to register! Just visit their fan pageand click the ‘Like’ button. Then you’d be able to download Kaspersky Internet Security 2012 that has a 90-day trial license integrated. (It’s a German installer).
2.But  you can download it using the DIRECT LINK (German language setup).
3.Though you can also use the license code with the English version setup.
4.Use the following free Kaspersky Internet Security 2012 License Code: QCGUH-J8FF6-33WGA-UBY62 (from German installer)
5.If you are English user then Download KIS 2012 English Installer here and use the above license code.After installing this code you will get 90 days free Trail to use this KIS 2012.

Note:
This 90-day trial key code worked perfectly well on the fresh installation.That is free 90-day trial license key code will NOT work if you’ve pre-installed Kaspersky Internet Security 2012 and activated any trials before.
Thanks webtrickz for the info.