Correção: não é possível ativar o Windows Defender

Fix Unable to turn on Windows Defender: Windows Defender is an inbuilt antimalware tool that detects virus and malware on your system. However, there are some instances when users experience that they are unable to turn on Windows Defender in Windows. What could be the reasons behind this problem? There are many users who explored that installing any third party antimalware software cause this problem.

Also, if you go to Settings > Update & Security > Windows Defender then you will see that the Real-time protection in Windows Defender is turned on but it’s greyed out and also everything else is turned off and you can’t do anything about these settings. Sometimes the main issue is that if you have installed a 3rd party Antivirus service then Windows Defender will shut itself off automatically. No matter what reasons are behind this problem, we will walk you through the methods to solve this problem.

Why can’t I turn on my Windows Defender?

One thing we need to understand that Windows Defender provides complete protection to our system. Therefore, not able to turn on this feature could be a serious problem. There are many reasons for you not being able to turn on Windows Defender in Windows 10 such as third-party Antivirus might be interfering, Windows Defender is turned off by group policy, incorrect date/time issue, etc. Anyway, without wasting any time let’s see How to fix the underlying cause of this issue using the below-listed troubleshooting guide.

Fix Unable to turn on Windows Defender in Windows 10

Certifique-se de criar um ponto de restauração caso algo dê errado.

Method 1 – Uninstall any third-party Antivirus software

One of the most common causes of Windows Defender not working is third-party antivirus software. Windows Defender automatically shuts itself down once it detects any third party anti-malware software installed on your system. Therefore, you need to first start uninstallation any third party antimalware software. Moreover, you need to make sure that uninstallation is done properly all residue files of that software otherwise it will keep creating a problem for Windows Defender to get started. You can use some uninstaller software that will remove all remnants of your previous antivirus. Once the installations finished, you need to restart your system.

Method 2 – Run System File Checker (SFC)

Another method that you can opt for is system file diagnosis and repair. You can use command prompt tool to check whether Windows Defender files are corrupted. Moreover, this tool repairs all corrupted files.

1.Pressione a tecla Windows + X e selecione Prompt de Comando (Admin).

2.Type  sfc / scannow e pressione enter.

3.This process takes some time so be patient while running this command.

4.In case sfc command did not resolve the problems, you can use another command. Just type the below-mentioned command and hit Enter:

DISM / Online / Cleanup-Image / RestoreHealth

5.It will scan thoroughly and repair corrupted files.

6.After completing these steps, check if you’re able to fix Can’t Turn ON Windows Defender issue or not.

Método 3 – Execute uma inicialização limpa

Sometimes there are some third party applications cause this problem, you can easily find those ones by performing the clean boot function.

1.Pressione Windows + R e digite msconfig e pressione Enter.

2.On the system configuration Window, you need to navigate to Guia Serviços where you need to check to Esconder todos os serviços Microsoft e clique no desativar todos botão.

3. Navegue até Startup section e clique em Abra o Gerenciador de tarefas.

4.Here you will locate all startup programs. You need to botão direito do mouse on each program and Desabilitar all of them one by one.

5.After disabling all startup applications you need to come back to the system configuration window to salve todas as alterações. Clique em OK.

6.You need to reboot your system and check if you’re able to Fix Can’t Turn ON Windows Defender issue ou não.

To zero in on the issue you need to perform clean boot using this guide and find the problematic program.

Method 4 – Restart Security Center Service

Another method to get your Windows Defender problem solved is restarting security center service. You need to activate and ensure that certain services are enabled.

1.Pressione Windows + R e digite services.msc e pressione Enter

2.Here you need to search for Central de segurança e depois botão direito do mouse on Security Center and choose Reiniciar opção.

3.Now simply restart your device and check if the problem is solved or not.

Method 5 – Modify your registry

If you are still finding the problem in turning on the Windows Defender, you can opt for this method. You just need to modify the registry but before doing so make sure to create a backup of your Registry.

1.Pressione Windows + R e digite regedit. Agora pressione Enter.

2.Once you open the registry editor here you need to navigate to:

HKEY_LOCAL_MACHINESOFTWAREPolíticasMicrosoftWindows Defender

3.Select Windows Defender then in the right window pane find DisableAntiSpyware DWORD. Now double click this file.

4.Set the value data to 0 and click OK to save the settings.

Observação: If you’re facing permission issues then right-click on Windows Defender e selecione Permissões. Follow this guide in order to take full control or ownership of the above registry key and again set the value to 0.

5.Most probably, after doing this step, your Windows Defender will start working on your system properly without any problem.

Método 6 - Set Windows Defender Service to Automatic

Observação: Se o serviço Windows Defender estiver esmaecido no Gerenciador de Serviços, então siga esta postagem.

1.Pressione a tecla Windows + R e digite services.msc e pressione Enter.

2.Encontre os seguintes serviços na janela Serviços:

Serviço de Inspeção de Rede do Windows Defender Antivirus
Serviço do Windows Defender Antivirus
Serviço da Central de Segurança do Windows Defender

3. Clique duas vezes em cada um deles e certifique-se de que o tipo de inicialização esteja definido como Automático e clique em Iniciar se os serviços ainda não estiverem em execução.

4.Clique em Aplicar seguido de OK.

5.Reinicie o seu PC para salvar as alterações e veja se você consegue Fix Can’t Turn ON Windows Defender issue.

Método 7 - Definir data e hora corretas

1.Clique no data e hora na barra de tarefas e selecione “Configurações de data e hora. "

2.Se estiver no Windows 10, faça “Definir hora automaticamente"Para"on. "

3.Para outros, clique em “Horário da Internet” e marque “Sincronize automaticamente com o servidor de horário da Internet. "

4.Selecione Servidor “time.windows.com”E clique em atualizar e “OK”. Você não precisa concluir a atualização. Basta clicar em OK.

Again check if you are able to Fix Windows Defender Does Not Start issue or not, if not then continue with the next method.

Method 8 – Run CCleaner and Malwarebytes

1. Baixe e instale Ccleaner & Malwarebytes.

2.Execute o Malwarebytes e deixe-o verificar seu sistema em busca de arquivos prejudiciais.

3.Se for encontrado malware, ele os removerá automaticamente.

4.Agora corra Ccleaner e na seção “Limpador”, na guia Windows, sugerimos verificar as seguintes seleções a serem limpas:

5.Depois de verificar se os pontos corretos foram verificados, basta clicar Execute o limpador, e deixe o CCleaner seguir seu curso.

6.Para limpar ainda mais o seu sistema, selecione a guia Registro e certifique-se de que o seguinte esteja verificado:

7.Selecione Scan for Issue e permita que o CCleaner faça a varredura e clique em Corrigir problemas selecionados.

8.Quando CCleaner pergunta “Você deseja fazer backup das alterações no registro?” selecione Sim.

9.Depois que o backup for concluído, selecione Corrigir todos os problemas selecionados.

10.Reinicie o seu PC para salvar as alterações e veja se você consegue Fix Can’t Turn ON Windows Defender issue.

Method 9 – Update Windows Defender

1.Pressione a tecla Windows + X e selecione Prompt de comando (Admin).

2.Digite o seguinte comando em cmd e pressione Enter após cada um:

“%PROGRAMFILES%Windows DefenderMPCMDRUN.exe” -RemoveDefinitions -All

“%PROGRAMFILES%Windows DefenderMPCMDRUN.exe” -SignatureUpdate

3.Once the command finish processing, close cmd and reboot your PC.

Method 10 – Update Windows 10

1.Pressione a tecla Windows + I para abrir Configurações e clique em “Atualizações e Segurança"Ícone.

2.Agora, no painel esquerdo da janela, certifique-se de selecionar Windows Update.

3. Em seguida, clique em “Verificar atualizações”E deixe o Windows baixar e instalar todas as atualizações pendentes.

Recomendado:

Hopefully, above mentioned all methods will help you to Fix Unable to turn on Windows Defender in Windows 10 Issue. However, you need to understand that these methods should be followed systematically. In case you have more questions related to this problem leave your comments below.