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When the Security Agent is scanning or updating, the icon in the system tray will display the following animated icon , and the option to unload the Security Agent will be grayed out.

Open WFBS

Click the image to enlarge.

You can unload the Security Agent through the CLI as a workaround to forcibly stop it. Please refer to the article below for the procedures:Unloading the Security Agent of Worry-Free Business Security Services (WFBS-SVC)