This video shows you how to use Window Defender on your computer. Go to the start button on the screen and click it. Next, select the control panel. At this point you can type in the word 'Defender' or find the icon in the control panel. Once the Windows Defender page comes up you should be able to see whether or not the program is active. If it isn't active then simply activate it. This program should be run because it helps protect you against spyware and other unwanted activity on your computer. With the window open you can run a scan manually or check the status of the program itself.