This tutorial contains step by step instructions on how to lớn Turn On or Off the Windows Defender Antivirus (Microsoft Security Essentials in Windows 7, Windows 8 và Windows 10 OS. In Windows 7 & Vista OS, the “Windows Defender” was named “Security Essentials” và if you want to lớn use it for your protection, then you can download and install it directly from Microsoft’s Website. In Windows 10 và Windows 8 OS, the Windows Defender comes pre-installed on your PC và it is enabled by default on your system.

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– In the first part of this guide you can find instructions on how you can enable (Turn ON) the Windows Defender Antivirus on your computer & some extra steps to troubleshoot common issues while enabling Windows Defender.

– At the second part of this tutorial, you will learn how you can disable (Turn OFF) the Windows Defender protection, in case you have problems with it, or you prefer khổng lồ use another (3rd party) security application on your computer.

 

How to Enable or Disable Windows Defender on Windows 10, 8, 8.1, 7 & Vista OS.

 

Part 1. How lớn Enable Windows Defender.

Part 2. How lớn Disable Windows Defender

FIX: Can’t turn on Windows Defender.

 

Part 1. How lớn Turn On Windows Defender protection.

Windows 7 và Vista.

– lớn Enable and use Security Essentials (MSE) in Windows 7 and Windows Vista for your protection:

1. Uninstall any other (3rd party) Antivirus from your system, from Control Panel –> Programs –> Programs và Features.

2. Download and Install Security Essentials from Microsoft. When the installation is completed, normally Security Essentials will be enabled automatically on your system. If not…

3. Navigate to Control Panel –> System và Security –> Action Center.

4. At Security section click the Turn on now button next to Spyware and unwanted software protection. *

* Note: If you cannot turn on Security Essentials, then follow the instructions below lớn resolve this issue.

 

Windows 8, 8.1.

– In Windows 8 & 8.1 the Windows Defender comes preinstalled on your system. If you want khổng lồ use Windows Defender as your antivirus program on Windows 8 và Windows 8.1:

1. Uninstall any other (3rd party) Antivirus from your system, from Control Panel –> Programs –> Programs và Features.

2. Navigate khổng lồ Control Panel –> System & Security –> Action Center.

4. At Security section click the Turn on now button next to Spyware và unwanted software protection. *

* Note: If you cannot turn on Windows Defender, then follow the instructions below to resolve this issue.

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Windows 10.

– lớn enable the Windows Defender protection in Windows 10:

1. Uninstall any other (3rd party) Antivirus from your system, from Control Panel –> Programs –> Programs & Features.

2. Then go to Settings -> Update & Security -> click at Windows Security on the left and then click Open Windows Security.

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3. Then click the Turn On the Virus và Threat Protection. *

* Note: If you cannot turn on Windows Defender, then follow the instructions below lớn resolve this issue.

 

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How to lớn FIX: Can’t Start Windows Defender (Windows Defender will Not Turn ON) issue.

If you can’t turn on, Windows Defender, by following the instructions above, then make the following modifications in Windows Registry:

1. Xuất hiện Registry Editor and navigate at:

HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows Defender

2. Right-click at Windows Defender folder and choose Permissions.

3. Click Advanced –> Owner: Change.

4. Enter “Administrators” (without quotes) at “Enter the name to lớn select” box and hit OK.

5. Check the “Replace owner on subcontainers and objects” box.

6. Select Administrators from the list và click Edit.

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7. Select the Full Control box and hit OK 3 times to lớn close permissions properties.

8. At the right pane xuất hiện the DisableAntiSpyware & DisableAntiVirus DWORD values and change the value data to 0 (from 1).

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9. Close registry editor.

10. Navigate lớn C:Program FilesWindows Defender folder and open the MSASCui.exe application.

 

Part 2. How to Turn OFF Windows Defender.

 

Windows 7 và Vista.

– lớn Disable (Turn Off) Security Essentials protection, on Windows 7 and Windows Vista, then uninstall the program “Microsoft Security Essentials” from: Control Panel –> Programs –> Programs và Features.

 

Windows 10, 8, 8.1.

– There is no way to uninstall Windows Defender on Windows 10,8 & 8.1, but you can follow the instructions mentioned below lớn completely disable (Turn OFF) Windows Defender và it’s services in registry:

1. Open Registry Editor and navigate at:

HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows Defender

2. Right-click at Windows Defender folder and choose Permissions.

3. Click Advanced –> Owner: Change.

4. Enter “Administrators” (without quotes) at “Enter the name lớn select” box và hit OK.

5. Kiểm tra the “Replace owner on subcontainers & objects” box.

6. Select Administrators from the list and click Edit.

7. Select the Full Control box và hit OK 3 times lớn close permissions properties.

8. At the right pane change the value data of DisableAntiSpyware & DisableAntiVirus DWORD values to lớn 1 (from 0). *

 

* chú ý for Windows 10: If you cannot modify the above values, then Turn Off the Real-time protection. (Settings –> Update và Security -> Windows Defender –> Real Time Protection = OFF). When done, change the registry values as described above.

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That’s it! Did it work for you?

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