If Kaspersky Internet Security 2010 is installed on your computer and you would like to upgrade to Kaspersky Internet Security 2011, you should do the following:

1. download the product distributive of Kaspersky Internet Security 2011 from the Kaspersky Lab’s official site  http://www.kaspersky.com/productupdates
2. uninstall Kaspersky Internet Security 2010. During the process, save the application objects
3. run the downloaded file
4. follow the instructions of the Setup Wizard
5. restart your computer
6. activate version 2011.