Is your Windows Defender not turning on? Are you looking for full solutions to lớn get rid of this issue? This post will show you how khổng lồ repair Windows Defender in Windows 10/8/7 so your PC can be protected from viruses. We will also introduce a professional backup software for PC protection.

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Windows Defender Will Not Turn on Windows 10/8/7

Windows Defender (also called Windows Defender Security Center in Windows 10 1703 or later), a fully integrated part of Windows, is an antivirus program. It can offer real-time protection from various threats lượt thích spyware, malware, và viruses to lớn your PC. Once it scans and finds potential threats, this program will stop them.

However, many users have reported that their Windows Defender can"t be turned on for virus defense in Windows 10/8/7 when they click on the Turn on button.


One Windows 10 user from tomsguide said:

"A few days back I turned it off completely using group edit policy, but now when I try to put on the real-time protection slider, it asks for permission but then nothing happens..."tomsguide

In addition to lớn the case when Windows Defender could be turned off by group policy, some users said Windows Defender gets an unexpected error and cannot be opened or Windows Defender can"t mở cửa after uninstalling Avast, Bitdefender, McAfee, AVG.

To put it simply, this issue is possibly caused by the installation of third-party antivirus software, a corrupted registry, software conflicts, và so on. For Windows 7, Windows 8 & Windows 10 users, it is fairly common.

Well then, what to vì if you are troubled by Windows Defender not working? How khổng lồ turn on Windows Defender in Windows 8/10/7 successfully? Take it easy! Get the full solutions from the following part khổng lồ help you out.

Further tip: If your Windows Defender can work normally, but you have a need lớn disable it, you can watch the following video.

How khổng lồ Repair Windows Defender Windows 10/8/7

Method 1: Uninstall Third-party Antivirus Software

If you have installed any third-party software on your computer, Windows operating system will automatically detect it and turn itself down. Thus, the first thing you can try is lớn disable your other security programs.


If that is not working, the best way is to lớn completely remove them. To vì this, go to Control Panel > Programs và Features in Windows 7 or navigate to Control Panel > Programs > Uninstall a program in Windows 10/8.

Then find your third-party program, right-click on it & choose Uninstall or Uninstall/Change to remove it to lớn get rid of Windows Defender not turning on issue.


Alternatively, you can use a professional removal tool khổng lồ uninstall your security applications, remove all files (including undetected files) và registry entries associated with the application, which may also prevent you from running Windows Defender.

Finally, restart your PC & try launching Windows Defender again to see if it can be turned on for virus, spyware & other threats protection.

Method 2: Restart the Security Center Service

In order khổng lồ let Windows Defender work properly, you need to lớn enable certain services. If those services aren"t running well, the issue of Windows Defender not turning on will happen on Windows 10/8/7. So, follow the instructions to restart necessary services, và here we will show you enabling Security Center service.

Step 1: Click Win & R keys on your keyboard lớn launch the Run box.

Step 2: input services.msc in the box và press Enter.

Step 3: In the Services interface, search for Security Center service và right-click on it to lớn choose the Restart option.


Once this service is restarted, you can kiểm tra if the issue -Windows Defender not starting is solved.

Method 3: Run an SFC Scan

If Windows Defender will not turn on Windows 10/8/7 and runs into an unexpected error, perhaps there is something wrong with your system files. So, you can perform an SFC scan.

SFC, known as System file Checker, is a utility in Windows that allows you khổng lồ scan for corruptions in Windows system files & restore them. How to lớn scan your system files and repair missing or corrupted files? Here are the steps.

Step 2: In the Command Prompt window, type sfc /scannow command line và press the Enter key.

Then, this utility will begin a system scan. This process will take some time, so please wait patiently until verification reaches 100%.

Step 3: Later, exit the CMD window to kiểm tra whether Windows Defender unexpected error is resolved.


In order lớn fix the issue of Windows Defender Antivirus not turning on, you can try using DISM scan instead. To do that, follow the guide:

Step 1: Run Command Prompt as administrator.

Step 2: In the pop-up window, enter DISM /Online /Cleanup-Image /RestoreHealth và hit Enter to lớn execute this command line. Similarly, this scan will take some time, just wait và don"t interrupt it.


Method 4: Install the Latest Update

An outdated Windows operating system may cause the issue of Windows Defender not turning on. Some users reported that they had been able to lớn fix the issue simply by installing the latest Windows update - latest signature updates are necessary for Windows Defender khổng lồ keep your PC secure.


Back up Files or Windows OS before an Update

To back up crucial files, you can choose the professional backup software for Windows 10/8/7, shimatest.shop ShadowMaker since it allows you khổng lồ back up files into an image & sync files or folders to other safe locations. Now, get shimatest.shop ShadowMaker Trial Edition on your computer and then install it for tệp tin backup.

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Step 1: Run shimatest.shop ShadowMaker Trial.

Step 2: In the Backup page, go khổng lồ Source > Folders và Files to lớn choose important files that you want to lớn back up.


Then go khổng lồ Destination to choose the place where you need to save the backup. Here an external hard drive, USB drive, NAS, etc. Can be available.

Step 3: After finishing all the selections, click Back up Now button to lớn start the backup operation.


In addition, you can take full advantage of the Sync feature khổng lồ synchronize your important files. This tutorial - How khổng lồ Sync Folders Windows 10 khổng lồ External Drive? 3 Tools Are Here shows you detailed operating steps.

Upgrade Windows OS

Now, it is time for you khổng lồ install the latest Windows operating system. How to perform a Windows update? Here is the guide:

Step 1: In Windows 7, go to Control Panel and click Windows Update. In Windows 8, go to Control Panel > System and Security > Windows Update. In Windows 10, navigate to lớn Settings > Update & security lớn enter the Windows Update interface.

Xem thêm: Tổng Hợp 15 Ứng Dụng Quản Lý Công Việc Trên Ios, Phần Mềm Quản Lý Công Việc

Step 2: Click Check for updates. If there are available updates, install them and restart your PC.

After completing Windows updates, the problem of Windows Defender not turning on maybe disappeared.

Method 5: Change Your Group Policy

Sometimes, Windows Defender won"t turn on in Windows 10/8/7 because it is turned off by your group policy. This can be a problem but you are able khổng lồ fix it simply by changing the group policy.

To vị that, follow the step-by-step guide:

Step 1: xuất hiện the Run dialog by clicking Win + R keys on the keyboard.

Step 2: Type gpedit.msc & press the OK button.

Step 3: In the Local Group Policy Editor interface, go to lớn the left pane và navigate lớn Computer Configuration > Administrative Template > Windows Components > Windows Defender Antivirus.

Step 4: In the right pane, double-click on Turn off Windows Defender Antivirus.

Step 5: In the pop-up window, choose Not Configured, click the Apply and OK button.


After these changes are brought into effect, the issue of Windows Defender not working due to lớn the group policy being turned off should be solved, and you can run it to lớn protect your PC.

Method 6: Modify Windows Registry

When you fail to enable Windows Defender in Windows 10/8/7, the problem may be related to lớn your registry. Then, you can change it to lớn fix this issue.

Step 1: đầu vào regedit in the text box of the Run window.

Step 2: In the Registry Editor interface, go to

HKEY_LOCAL_MACHINESOFTWAREPoliciesMicrosoftWindows Defender

Step 3: Find DisableAntiSpyware key. If this key is not listed, please right-click the blank, choose New & DWORD (32-bit) Value to lớn create it.

Step 4: Right-click on it và set its Value data lớn 0.


After you have changed Windows Defender using Registry Editor, you can kiểm tra if Windows Defender Antivirus not turning on is solved.

Method 7: Perform a Clean Boot

If you start the Windows system in normal start-up operation, there might be many third-party applications running in the background. These applications can cause software conflicts and interfere with Windows. As a result, you can"t turn on Windows Defender in Windows 10/8/7.

To Repair Windows Defender issue, you can perform a Clean Boot. This method is quite simple and you can do by following these instructions:

Step 1: Launch the Run window, và enter msconfig in the textbox.

Step 2: In the System Configuration interface, go to the General tab, choose Selective startup và uncheck Load startup items.


Step 3: Under the Services tab, tick Hide all Microsoft services & click Disable all.


Step 4: Click the OKRestart button khổng lồ reboot your PC.

Now, all of the possible ways to fix Windows Defender not turning on have been shown to lớn you. Just try them one by one khổng lồ repair Windows Defender in Windows 10/8/7. If you think these ways are helpful, you can also giới thiệu them on Twitter khổng lồ let more people know.

Click to lớn tweet

Use shimatest.shop ShadowMaker khổng lồ Protect Your PC from Viruses và Other Threats

In order to protect your computer against spyware, ransomware, adware, viruses & other threats, you can try another way that is lớn use shimatest.shop ShadowMaker to back up your computer.

shimatest.shop ShadowMaker, one of the best backup software for Windows 10/8/7 users, is really worth recommending. In addition lớn backing up your important files (as mentioned above), it can help you easily and effectively back up your Windows operating system, disk, and partition. If your system ever goes wrong, you can use the backup lớn restore it khổng lồ a normal state.

Additionally, it supports disk cloning, which helps you transfer all the content on a disk lớn another for the entire disk data backup. For system disk cloning, the cloned drive can be used khổng lồ boot the PC in case of a system crash.

Are you interested in this backup software? Now get shimatest.shop ShadowMaker Trial Edition (30 days trial) from the following button.

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Step 1: Run this miễn phí backup software, continue lớn use the Trial Edition & choose the local backup mode.

Step 2: After entering the Backup page, you can see this program will back up your Windows system by default since the system partitions and destination path are chosen. Of course, you can click the SourceDestination module khổng lồ decide what you want to back up and where you need to save the image.

Next, just click Back up Now button to execute the operation in Manage page.


In addition, you can choose the entire system disk khổng lồ create a hard drive image. Or go to lớn Tools page to lớn use its Clone Disk feature to perform a disk cloning for backup.

Related article: How to lớn Clone a Hard Drive khổng lồ SSD in Windows 10/8/7?

Bottom Line

Can"t turn on Windows Defender Windows 10/8/7? How lớn turn on Windows Defender in Windows 10/8/7? We have shown you solutions khổng lồ fix the issue of Windows Defender not turning on; just try them one by one.

To keep your PC safe, you should use the professional & reliable PC backup software, shimatest.shop ShadowMaker to lớn back up the important files or Windows system automatically.

If you have any other solution lớn repair Windows Defender or any question related to shimatest.shop software, please tương tác us via or leave your idea in the comment part below.

Windows Defender Not Turning on FAQ

What to bởi vì if Windows Defender is not working?