Hello Donna,
if you install a third-party anti-virus/anti-spyware software, Windows Defender turns off automatically by itself. So, before turning on Windows Defender, please be sure that you have completely uninstalled the other anti-virus solution from your computer. Now, get your computer restarted and Defender will be turned on by itself.
After restarting if Defender does not turn on automatically, go to Start menu, type Windows Defender and press enter to execute Windows Defender. If the status shows that you have to turn it on manually, do so and you are done.
Please let us know and we are here to help you!
Regards, Mrityunjay.
You go to the start screen, and type in "windows defender". click on the icon that has the gray brick wall. It also has the label "Windows Defender". Hope i could help.
I believe it is part of MS Security Essentials, and no longer stand alone in 8.
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