Fix Windows Defender Does Not Start: If you are unable to turn on Windows Defender in Windows 10 then you are at the right place today we are going to see how to fix the issue. The main issue is that Windows Defender is automatically turned off and when you try to enable it, you won’t be able to Start WindowsDefender at all. When you click on “Turn ON” option you will receive an error message “This app has been turned off and isn’t monitoring your computer.”
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. If there are more than one security services running which are designed to do the same task then obviously they will create conflict. So, its always advised running only one Security application be it Windows Defender or the 3rd party Antivirus.
In some cases, the issue is caused because of incorrect date and time of the system. If this is the case here then you need to set the correct date & time and then again try to turn ON Windows Defender. Another important issue is Windows Update, if Windows is not up to date then it can easily cause trouble for Windows Defender. If Windows is not updated then it’s possible that the Windows Update is not able to download Definition update for Windows Defender which is causing the issue.
Anyway, now you are familiar with the issues which are causing the problem with Windows Defender.So without wasting any time let’s see how to actually Fix Windows Defender Does Not Start in Windows 10 with the help of below-listed troubleshooting guide.
Table of Contents
Fix Windows Defender Does Not Start
Make sure to create a restore point just in case something goes wrong.
Method 1: Disable 3rd party Antivirus Services
1.Right-click on the Antivirus Program icon from the system tray and select Disable.
2.Next, select the time frame for which the Antivirus will remain disabled.
Note: Choose the smallest amount of time possible for example 15 minutes or 30 minutes.
3.Once done, again try to access Windows Defender and check if you’re able to Fix Windows Defender Does Not Start Issue.
Method 2: Set Correct Date & Time
1.Click on the date and time on the taskbar and then select “Date and time settings.”
2.If on Windows 10, make “Set Time Automatically” to “on.”
3.For others, click on “Internet Time” and tick mark on “Automatically synchronize with Internet time server.”
4.Select Server “time.windows.com” and click update and “OK”. You don’t need to complete update. Just click 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 3: Start Windows Defender Services
1.Press Windows Key + R then type services.msc and hit Enter.
2.Find the following services in the Services window:
Windows Defender Antivirus Network Inspection Service
Windows Defender Antivirus Service
Windows Defender Security Center Service
3.Double-click on each of them and make sure their Startup type is set to Automatic and click Start if the services are not already running.
4.Click Apply followed by OK.
5.Reboot your PC to save changes.
Method 4: Enable Windows Defender from Registry Editor
1.Press Windows Key + R then type regedit and hit Enter to open Registry Editor.
2.Navigate to the following registry key:
3.Make sure you have highlighted Windows Defender in the left window pane and then double click on DisableAntiSpyware DWORD in the right window pane.
Note: If you don’t find the Windows Defender key and DisableAntiSpyware DWORD then you need to manually create both of them.
4.In the value data box of DisableAntiSpyware DWORD, change the value from 1 to 0.
1: Disable Windows Defender
0: Enable Windows Defender
5.Reboot your PC to save changes and see if you are able to Fix Windows Defender Does Not Start.
Method 5: Run SFC and DISM Tool
1.Press Windows Key + X then click on Command Prompt(Admin).
2.Now type the following in the cmd and hit enter:
Sfc /scannow sfc /scannow /offbootdir=c:\ /offwindir=c:\windows (If above fails then try this one)
3.Wait for the above process to finish and once done restart your PC.
4.Again open cmd and type the following command and hit enter after each one:
a) Dism /Online /Cleanup-Image /CheckHealth b) Dism /Online /Cleanup-Image /ScanHealth c) Dism /Online /Cleanup-Image /RestoreHealth
5.Let the DISM command run and wait for it to finish.
6. If the above command doesn’t work then try on the below:
Dism /Image:C:\offline /Cleanup-Image /RestoreHealth /Source:c:\test\mount\windows Dism /Online /Cleanup-Image /RestoreHealth /Source:c:\test\mount\windows /LimitAccess
Note: Replace the C:\RepairSource\Windows with the location of your repair source (Windows Installation or Recovery Disc).
7.Reboot your PC to save changes and see if you’re able to Fix Windows Defender Does Not Start.
Method 6: Run Windows Update Troubleshooter
1.Now type “troubleshooting” in Windows Search bar and click on Troubleshooting.
2.Next, from the left window pane select View all.
3.Then from the Troubleshoot computer problems list select Windows Store Apps.
4.Follow on-screen instruction and let the Windows Update Troubleshoot run.
5.Restart your PC and you may be able to Fix Windows Defender Does Not Start.
Method 7: Uncheck Proxy
1.Press Windows Key + R then type “inetcpl.cpl” and hit enter to open Internet Properties.
2.Next, Go to Connections tab and select LAN settings.
3.Uncheck Use a Proxy Server for your LAN and make sure “Automatically detect settings” is checked.
4.Click Ok then Apply and reboot your PC.
Method 8: Try to run Windows Update
1.Press Windows Key + I to open Settings then click on Update & Security.
2.From the left-hand menu select Windows Update.
3.Now under Update Settings in the right window pane click on Advanced options.
4.Uncheck the option “Give me updates for other Microsoft products when I update Windows.”
5.Restart your Windows and again check for updates.
6.You may have to run Windows Update more than once in order to complete the update process successfully.
7.Now as soon as you get the message “Your device is up to date“, again go back to Settings then click Advanced options and check mark “Give me updates for other Microsoft products when I update Windows.”
8.Again check for updates and you should be able to install Windows Defender Update.
Method 9: Manually Update Windows Defender
If Windows Update is not able to download Definition update for Windows Defender then you need to manually update Windows Defender in order to Fix Windows Defender Does Not Start.
Method 10: Run CCleaner and Malwarebytes
2.Run Malwarebytes and let it scan your system for harmful files.
3.If malware is found it will automatically remove them.
4.Now run CCleaner and in the “Cleaner” section, under the Windows tab, we suggest checking the following selections to be cleaned:
5.Once you’ve made certain the proper points are checked, simply click Run Cleaner, and let CCleaner run its course.
6.To clean your system further select the Registry tab and ensure the following are checked:
7.Select Scan for Issue and allow CCleaner to scan, then click Fix Selected Issues.
8.When CCleaner asks “Do you want backup changes to the registry?” select Yes.
9.Once your backup has completed, select Fix All Selected Issues.
10.Restart your PC to save changes and see if you’re able to Fix Windows Defender Does Not Start.
Method 11: Refresh or Reset your PC
1.Press Windows Key + I to open Settings then select Update & Security.
2.From left-hand menu select Recovery and click on “Get started” under Reset this PC.
3.Select the option to Keep my files.
4.Follow the instructions on the screen to complete the process.
5.This will take some time and your computer will restart.
Method 12: Repair Install Windows 10
This method is the last resort because if nothing works out then this method will surely repair all problems with your PC. Repair Install just uses an in-place upgrade to repair issues with the system without deleting user data present on the system. So follow this article to see How to Repair Install Windows 10 Easily.
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That’s it you have successfully Fix Windows Defender Does Not Start in Windows 10 but if you still have any questions regarding this guide then feel free to ask them in the comment’s section.