

It is highly recommended that you immediately update the virus and spyware definitions. Once it has been turned on, Windows Defender will open automatically.

In the System and Security window, click Action Center.This eliminates false conflicts between you and Windows Defender a security program that’s pre-installed in most computers running Windows operating systems. In the Control Panel window, click System and Security. Defender Control is a compact utility program designed to take charge of your Windows computer’s security features and disable it.NOTES: Because the Control Panel is a traditional Windows Desktop application, if you were not already there, the interface will change to the Desktop and the Control Panel window will open. Press the Windows Logo + X key combination on the keyboard and, from the list, click Control Panel.

If you prefer to use Windows Defender to protect your computer, you can disable or uninstall the currently installed anti virus software and then follow the steps below to enable Windows Defender. Microsoft® Windows® Defender is bundled with the Windows® 8 and 8.1 operating systems, but many computers have a trial or full version of other third-party anti virus protection program installed, which disables Windows Defender.
