Internet Explorer Add-on Installer Security Warning

Hello,
I have this error when I want to open Employee screen of Project and Job Costing in Sage 300 ERP. I don’t think that this error could be cause by the Add-On for Internet Explorer because I don’t remember to install any. Does anyone have a solution for this error ? What should I do ?
Thank you !

Windows was blocked this software because it can’t verify the publisher.
Name: ACCPACPM10-40.OCX
Publisher: Unknown Publisher
OK
