• Incorrect proxy server settings in the Kaspersky application.
• Incorrect system date.
• Incorrect security certificate settings in Internet Explorer.

1. Disable proxy server in the product settings.
2. Check the system date on your computer.
3. Open Internet Explorer and click the gear icon in the upper-right corner. 
4. Сlick Internet options.

5. In the Internet options window, go to the Advanced tab and clear the following checkboxes:
   • Check for publisher's certificate revocation.
   • Check for server certificate revocation.
   • Check for signatures on downloaded programs.
6. Click Apply.

If the error persists, contact Kaspersky technical support by choosing the topic and filling out the form.