From the FAQ

I have forgotten the password to Kaspersky Anti-Virus 6.0Kaspersky Internet Security 6.0. What should I do?

In Kaspersky Anti-Virus 6.0 and Kaspersky Internet Security 6.0 the user can protect the settings of Kaspersky Anti-Virus 6.0 and Kaspersky Internet Security 6.0 from changes by a password. If you have forgotten the password, it can even be impossible to mange the settings and functionality of Kaspersky Anti-Virus. To disable password-protection, do the following:

* restart your computer in Safe Mode
* go to the folder in which Kaspersky Anti-Virus 6.0 or Kaspersky Internet Security 6.0 was installed. By default these products are installed in the following folders:

Kaspersky Anti-Virus 6.0: C:\Program Files\Kaspersky Lab\Kaspersky Anti-Virus 6.0

Kaspersky Internet Security 6.0: C:\Program Files\Kaspersky Lab\Kaspersky Internet Security 6.0

*
rename the file avp.exe (to temp.exe for example)

*
restart your computer in the normal mode
*
run the renamed file
*
open the main application window of Kaspersky Anti-Virus 6.0\Kaspersky Internet Security 6.0
*
go to the Service tab
*
go to the Settings section
*
in the Protection section disable the options Enable Self-Defense and Enable password protection.
*
apply the made changes

*
exit Kaspersky Anti-Virus 6.0\Kaspersky Internet Security 6.0 (right-click the Kaspersky icon and in the menu select Exit)
*
go to the folder into which you have installed Kaspersky Anti-Virus 6.0 or Kaspersky Internet Security 6.0
*
give the avp.exe file its initial name back
*
start Kaspersky Anti-Virus 6.0\Kaspersky Internet Security 6.0
*
open the main window of Kaspersky Anti-Virus 6.0\Kaspersky Internet Security 6.0
*
go to the Protection tab
*
go to the Settings section
*
in the Setting manager section click the Reset button
*
in the setup wizard window click the Next buttons till the Password window opens
*
enable password protection of Kaspersky Anti-Virus 6.0\Kaspersky Internet Security 6.0
*
enter a new password (any figure, for example)
*
finish the setup wizard by clicking the Next buttons and till you click the Finish button

After these actions settings protection of Kaspersky Anti-Virus 6.0\ Kaspersky Internet Security 6.0 will be protected by the password you entered in the Setup Wizard and if necessary you can set a new password again.