The security certificate ensures that data exchanged between the web server and browser remains private and integral. You may get the message "The security certificate has expired or is not yet valid," when the certificate expires or is not yet valid according to the time set on your computer. If the expiration date of the certificate hasn't passed, double check your computer's clock. The clock settings may be incorrect. Set the correct time, date and time zone on your computer, close your browser and then try accessing the site again.
Before you begin you’ll need to determine the version of Windows you're using.
Ensure that the time, date, and time zone are set correctly
If the time and date on your computer is incorrect, you may receive the message "The security certificate has expired or is not yet valid." To resolve this issue, ensure that the time, date and the time zone are set correctly. Check out our article, Ensure that the date time and time zone on your computer are set correctly for help.
Contact your computer manufacturer or a local computer technician
If correctly setting the time, date and time zone hasn't resolved the issue, we recommend you contact your computer manufacturer. If your computer is no longer under warranty, get in touch with the experts for further assistance. Let the computer manufacturer or local technician know that you’re unable to install programs and access websites. Ask him or her to troubleshoot the problem as "related to Internet Explorer."