If a Kaspersky Lab product installed on your computer displays the error "Activation error: Untrusted server certificate" or "Activation error: 0x00000025", then in order to resolve the problem, perform the following actions:
See if the system date is set correctly.
Сheck if you have the Internet access. In order to do so, launch the browser Internet Explorer and open the site www.kaspersky.com.
If Firewall is installed on your computer, make sure that an allowing rule is created for the process avp.exe in the Firewall settings.
Firewall secures your computer protection on local networks and Internet. Firewall is a program which monitors data transferred via Internet or local networks. According to the Firewall settings, it blocks or allows data transferring.
If the recommendations described above did not help to resolve the problem, try to activate later (in about an hour).
If the error keeps repeating create a request to Kaspersky Lab Technical Support via the My Kaspersky Account service. Describe you problem in all details.
How to check the system date on the computer?How to activate Kaspersky Internet Security 2013
Release of antivirus database updates (required to protect your computer/server/mobile device)
Providing technical support over phone / web
Release of patches for the application (addressing detected bugs)
*Installation under Windows 8.1 is not supported by the current version.
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