Windows Defender Won't Start in Windows 10 Fix

4) Restart the Security Center Service

1. Press Windows key + Rg > launch Run. Type services. msc > hit Enter or click OK.
2. In Services, search for Security Center. Right-click on Security Center> > click on Restart.
3. Once you restart the required services, check if the problem with Windows Defender is resolved.

1. How do I fix Windows Defender not opening?
2. Why can't I turn on Windows Defender Windows 10?
3. How do I force Start Windows Defender?
4. How do I fix Windows Defender in Windows 10?
5. Why is my Windows Defender not working?
6. How do I restore Windows Defender?
7. Why is my Windows Defender antivirus turned off?
8. How do I fix a corrupted Windows Defender?

How do I fix Windows Defender not opening?

When you encounter these problems, here are some things you can try:

• Restart your PC. ...
• Remove existing antivirus and antispyware software. ...
• Scan your PC for malwares. ...
• SFC scan. ...
• Clean Boot. ...
• Restart Security Center Service. ...
• Delete conflicting Registry Entry. ...
• Enabling Windows Defender from Group Policy.

Why can't I turn on Windows Defender Windows 10?

If Windows Defender real-time protection won't turn on Windows 10, then you should check its settings. Sometimes, the date and time settings are the reason why Windows Defender won't turn on. Using dedicated software solves the failure of the Windows Defender antivirus to turn on in Windows 10.

How do I force Start Windows Defender?

Turn on Windows Defender

1. Select the Start menu.
2. In the search bar, type group policy. ...
3. Select Computer Configuration > Administrative Templates > Windows Components > Windows Defender Antivirus.
4. Scroll to the bottom of the list and select Turn off Windows Defender Antivirus.
5. Select Disabled or Not configured. ...
6. Select Apply > OK.

How do I fix Windows Defender in Windows 10?

Replies (64) 

1. Press Windows + X, Click on control panel.
2. On right top corner click on View and then choose large items.
3. Now from the list click on Windows Defender and try to enable it.
4. Press Windows + R, to open run prompt.
5. Type services. ...
6. Under services look from Windows defender service and start the service.

Why is my Windows Defender not working?

Sometimes Windows Defender won't turn on because it's disabled by your group policy. This can be a problem, but you can fix it simply by changing that group policy. To do that, just follow these steps: Press Windows Key + R and enter gpedit.

How do I restore Windows Defender?

How to Reset Windows Defender Firewall

1. Navigate to the Start menu and open the Control Panel.
2. Click on the Windows Defender tab and choose the Restore defaults option from the left side panel.
3. Click on the Restore defaults button and confirm your action by clicking Yes in the confirmation window.

Why is my Windows Defender antivirus turned off?

If Windows Defender is turned off, this may be because you have another antivirus app installed on your machine (check Control Panel, System and Security, Security and Maintenance to make sure). You should turn off and uninstall this app before running Windows Defender to avoid any software clashes.

How do I fix a corrupted Windows Defender?

Solution 3 – Run an SFC scan

According to users, sometimes Windows Defender service won't start because of file corruption. Your system files can get corrupted and that can cause this error to appear. However, you can fix the problem simply by running an SFC scan.