How to Turn On or Off Windows Defender Antivirus in Windows 10Windows Defender Antivirus helps protect your PC against malware (malicious software) like viruses, spyware, and other potentially unwanted software. Malware can infect your PC without your knowledge: it might install itself from an email message, when you connect to the Internet, or when you install certain apps using a USB flash drive, CD, DVD, or other removable media. Some malware can also be programmed to run at unexpected times, not only when it's installed.Windows Defender is included with Windows and helps keep malware from infecting your PC in two ways:. Providing real-time protection. Windows Defender notifies you when malware tries to install itself or run on your PC. It also notifies you when apps try to change important settings. Providing anytime scanning options.
Windows Defender automatically scans your PC for installed malware on a regular basis, but you can also start a scan whenever you want. Windows Defender automatically removes (or temporarily quarantines) anything that's detected during a scan.In Windows 10 you can, but it will only be temporary. Windows will automatically turn real-time protection back on if it's off for a while.For Windows 10, Microsoft has revamped Windows Defender and combined it with Microsoft System Center Endpoint Protection.
Unlike with Microsoft System Center 2012 R2, there will be no System Center Endpoint Protection client to deploy to Windows 10 machines because Windows Defender is built into the operating system and enabled by default.In addition to simplified deployment, Windows Defender contains several improvements. The most important improvements to Windows Defender are:.
Early Launch Antimalware (ELAM) compatible. After Secure Boot has verified that the loading operating system is trusted, ELAM can start a registered and signed antimalware application before any other operating system components. Windows Defender is compatible with ELAM.
Local context for detections and centralized sensory data. Unlike most antimalware software and previous versions of Windows Defender, Windows Defender in Windows 10 reports additional information about the context of discovered threats. This information includes the source of the content that contains the threat as well as the historical movement of the malware throughout the system. When collection is complete, Windows Defender reports this information (when users elect to enable cloud-based protection) and uses it to mitigate threats more quickly. User Account Control (UAC) integration.
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Windows Defender is now closely integrated with the UAC mechanism in Windows 10. Whenever a UAC request is made, Windows Defender automatically scans the threat before prompting the user, which helps prevent users from providing elevated privileges to malware. Simplified management. In Windows 10, you can manage Windows Defender much more easily than ever before. Manage settings through Group Policy, Intune, or Configuration Manager.This tutorial will show you how to completely turn on or off Windows Defender for all users in Windows 10.You must be signed in as an administrator to be able to turn on or off Windows Defender.When you install some 3rd party antivirus (AV) programs, they may automatically turn off Windows Defender. In this case you may not be able to turn on Windows Defender again until the 3rd party AV program has been disabled (turned off) or completely uninstalled.If you have a 3rd party AV program installed and disable Windows Defender Antivirus, this will also disable.
As long as you have Windows Defender turned on and real-time protection enabled, you're good to go.:)I also followed the steps ('Disabled' the Turn off Windows Defender) but it seems that Windows Defender doesn't seem to stay on. If I restart or turn on the laptop, the Windows Defender icon is no longer displayed on the system tray (I set this to always show) and I get a notification right above the system tray (coming from the bottom right side) within minutes after starting Windows that I need to turn on virus protection (or something similar as it shows for a split second with a sound alert) Windows Defender - it says Real-time protection is On but still nothing in the system tray. If I scroll down and click 'Use Windows Defender' then it shows up in the system tray and stays there until the next restart. Is it really turned on if I get Windows notifications telling me to turn it on (or say I need virus protection)? The Windows Defender icon in the notification area is not a reliable method to tell if WD is running or not.Instead, if WD shows that it and real-time protection is turned on, then WD is running in the background.:)Thanks for your help Brink, I was able to get a screen shot.
I had the Windows Defender settings window open plus Security and Maintenance from Control Panel window open just before the notification showed up from the right side. It seems to suggest otherwise?EDIT: Just to be clear I caught this screenshot the 'moment' the bottom-right notification appeared.
Once the notification disappears, it then refreshes Security and Maintenance and changes to saying Windows Defender is ON instead of OFF as shown. Sorry I didn't realize this sooner as I was looking for help quickly instead of being patient.
Can't Turn On Windows Defender 8.1
Why can't I turn on Windows Defender virus protection?Today I noticed that my Windows Defender virus protection was off. I've been through countless blog entries, articles, and forums but I can't find anything that makes a difference.I'm running Windows 10, Version 1803 (OS Build 17134.345)I don't have any other antivirus software installed.Here's the warning in Control Panel's Security and Maintenance section:Clicking 'Turn on now' brings up this blank Security Center window:Under 'Virus & threat protection', if I click 'Scan now' nothing happens. I had the same sort of symptoms. In the Windows Security Center, under Virus and threat protection, it said 'Your virus & threat protection is managed by your organization.' I note you mentioned the Registry Keys under HKLM/SOFTWARE/Microsoft/Windows Defender. Nice spotting, but it seems like there is another key that is causing the problem for some users.Steps to a solution:.
Press the Windows key and type 'regedit'. On the regedit icon that appears, right-click and select Run as Administrator.
Can't Turn On Windows Defender Windows 10
Navigate to the folder located at HKLMSOFTWAREPoliciesMicrosoftWindows Defender (You can paste this into the address box at the top of the window, or navigate manually using the side directory structure). In this folder, there are probably two keys. Right-click and Delete the DisableAntiSpyware key. Exit regedit, and return to the Windows Defender settings screen (refresh it if necessary). Windows Defender should have the scan options available and working.Solution adapted from, with a much more detailed solution.
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