Fix Kan ikke tænde 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

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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. Tryk på Windows-tasten + X og vælg derefter Kommandoprompt (Admin).

2. Skriv  sfc / scannow og tryk 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.

Metode 3 – Udfør Clean Boot

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

1. Tryk på Windows + R og skriv msconfig og tryk på Enter.

2.On the system configuration Window, you need to navigate to Fanen Tjenester where you need to check to Skjul alle Microsoft-tjenester og klik på Deaktiver alle .

3.Navigate to Startup section og klik på Åbn Task Manager.

4.Here you will locate all startup programs. You need to Højreklik on each program and Deaktiver all of them one by one.

5.After disabling all startup applications you need to come back to the system configuration window to save all the changes. Klik på OK.

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

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. Tryk på Windows + R og skriv services.msc og tryk på Enter

2.Here you need to search for Security Center og så Højreklik on Security Center and choose Genstart valgmulighed.

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. Tryk på Windows + R og skriv regedit. Tryk nu på Enter.

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

HKEY_LOCAL_MACHINESOFTWAREPolitikkerMicrosoftWindows 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.

Bemærk: If you’re facing permission issues then right-click on Windows Defender og vælg Tilladelser. 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.

Metode 6 - Set Windows Defender Service to Automatic

Bemærk: Hvis Windows Defender-tjenesten er nedtonet i Services Manager, så følg dette indlæg.

1. Tryk på Windows-tasten + R og skriv derefter services.msc og tryk på Enter.

2.Find følgende tjenester i vinduet Tjenester:

Windows Defender Antivirus Network Inspection Service
Windows Defender Antivirus Service
Windows Defender Security Center Service

3. Dobbeltklik på hver af dem, og sørg for, at deres starttype er indstillet til Automatisk Ur og klik på Start, hvis tjenesterne ikke allerede kører.

4. Klik på Anvend efterfulgt af OK.

5. Genstart din pc for at gemme ændringer og se, om du er i stand til det Fix Can’t Turn ON Windows Defender issue.

Metode 7 - Indstil korrekt dato og klokkeslæt

1.Klik på dato og tid på proceslinjen og vælg derefter "Indstillinger for dato og klokkeslæt".

2.Hvis på Windows 10, lav "Indstil tid automatisk"Til"on".

3. For andre, klik på "Internettid" og sæt flueben ved "Automatisk synkronisering med internettidsserver".

4. Vælg server “time.windows.com” og klik på opdater og ”OK”. Du behøver ikke at fuldføre opdateringen. Bare klik på OK.

Tjek igen om du er i stand til det Fix Windows Defender Does Not Start issue eller ej, hvis ikke, så fortsæt med den næste metode.

Method 8 – Run CCleaner and Malwarebytes

1.Download og installer CCleaner & Malwarebytes.

2.Kør Malwarebytes og lad det scanne dit system for skadelige filer.

3.Hvis der findes malware, vil den automatisk fjerne dem.

4. Kør nu CCleaner og i afsnittet "Renere" under fanen Windows foreslår vi, at du kontrollerer følgende valg, der skal renses:

5. Når du har sikret dig, at de rigtige punkter er kontrolleret, skal du blot klikke Kør Cleaner, og lad CCleaner køre sin gang.

6. For at rense dit system yderligere skal du vælge fanen Registrering og sikre, at følgende er markeret:

7. Vælg Scan for Issue, og lad CCleaner scanne, og klik derefter Løs udvalgte problemer.

8. Når CCleaner spørger "Vil du have backup ændringer til registreringsdatabasen?” vælg Ja.

9. Når din sikkerhedskopiering er fuldført, skal du vælge Fix All Selected Issues.

10. Genstart din pc for at gemme ændringer og se, om du er i stand til det Fix Can’t Turn ON Windows Defender issue.

Method 9 – Update Windows Defender

1. Tryk på Windows-tasten + X og vælg derefter Kommandoprompt (Admin).

2. Indtast følgende kommando i cmd og tryk på Enter efter hver kommando:

“%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. Tryk på Windows-tasten + I for at åbne Indstillinger og klik derefter på "Opdatering og sikkerhed"Ikonet.

2. Sørg nu for at vælge fra venstre vinduesrude Windows Update.

3. Klik derefter på "Søg efter opdateringer”-knappen og lad Windows downloade og installere eventuelle ventende opdateringer.

Anbefalet:

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.