Real-time protection runs in the background, always on the lookout for spyware that attempts to install itself or to run . To enable real-time protection, open the Options page and click Real-Time Protection . For full protection, be sure that all check boxes are selected.
When real-time protection is enabled, if Windows Defender encounters spyware (or suspected spyware), an alert appears by the Action Center icon in the notification area, as shown below.
Potentially harmful software detected * x i w Click to review and take action
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