Here is the guide on how to handle a lost password for Kaspersky Endpoint Security 11.
If you don't have access to the Kaspersky Security Console, you can reset the password using the local interface:
You did not enable Safe Mode with Command Prompt OR the system has Secure Boot + BitLocker. You must physically disable Secure Boot in BIOS temporarily.
with your new password.
and double-click the policy for Kaspersky Endpoint Security for Windows. Disable Protection General settings . Under the Password protection block, uncheck Enable password protection and save your changes. Set New Password : Check the Enable password protection