Click "Start," type "Security" in the search box and select "Microsoft Security Essentials" from the list of programs. Alternatively, if it's already running, right-click the icon in the system tray and click on "Open". 2. Click on the "Settings" tab to display various settings for security requirements. If you need any more info you can call @ Microsoft Contact Number UK 0808-101-2159 (Toll-Free) always available UK for you, if you have any technical issues, you can take help of number. At here, we have provided service for printers, antivirus programs, email services, software applications.