If you have a Kaspersky Internet Security and Antivirus 2010 the trial version then you can use it for unlimited time resetting its trial period. If you do not have the trial version you can download from this link http://esd.element5.com/pimages/50105/kaspersky_internet_security_2010_trial.html.
When you install this software this works for 30 days and after that period the license expires and it stops to work unless you buy the software. But there is another way to activate this software and that is resetting the trial period again. You can reset the trial period as much as you can. To do this you have to download the resetting software which you can download from the following link.
To know the procedure to reset the software this video will help you and you can do it easily.
Now enjoy the software for free for unlimited time....