How to remove a Root Certificate in Internet Explorer?
Browsers | Internet Explorer
Click the gear icon in the upper right corner.
Select "Internet options" from the dropdown menu.
In the "Internet options" panel, select the "Content" tab and click "Certificates".
In the "Certificates" panel, click the "Trusted Root Certification Authorities" tab and selecht the certificate you want to remove.
To actually delete the certificate, click the "Remove" button.
Browsers, Internet Explorer, Root Certificate