When I enter the activation code and click in Enabling, Error: Untrusted server certificate.

When I enter the activation code and click on Activate, the following word is displayed after attempting at activate additionally failing:

Non-trusted remote certificate.

What can I do? I tried all the solutions provided the the KAV website without success

Thank it dear kmscom. I deactivated the proxy in Kaspersky settings, and then ME entered the activation code, and activation was succesfull.

Thank you for the links, the solution was for the first link.