The cause of the error is incorrect system date on the user’s computer.
In order to resolve the problem, check the system date on your computer (in the right bottom corner of the screen). If the date is incorrect, set it correctly; after it repeat the activation procedure once again.
If the system date is correct, try to activate the application later (in about 15 minutes).
If the error keeps repeating create a request to Kaspersky Lab Technical Support via theweb-form. In the request describe in details the situation and actions which you performed to resolve the problem.