The Microsoft Security Essentials installation process doesn't necessarily configure your computer to display its icon in the system tray. If you want to see the icon in your task bar, you'll have to open its properties and set it to display the Microsoft Security Essentials icon instead of showing only system notifications.
Click the Start Menu and type "Microsoft Security Essentials" in the Start Menu's search bar.
Click Microsoft Security Essentials from the search results to make sure Microsoft Security Essentials is running.
Right click on the system tray and select "Properties."
Click "Customize notification icons" in the window that pops up and then locate Microsoft Security Essentials from the list of applications.
Click on the drop-down menu next to Microsoft Security Essential and select "Show icon and notifications." Click the "OK" button to save your changes.
The information in this article applies to Windows 7 and some earlier versions of Windows. Windows 8 uses Windows Defender rather than Microsoft Security Essentials.
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