If Window Defender Service Won’t Start on Window 10! How To Fix it?

If Window Defender won’t start then your device are open to internet threats like malware and viruses. So, to fix the issue you should disable third party antivirus solution and install the latest Window updates. In this blog, you will read the solution to fix if Window Defender won’t start. For more information about Window 10, just visit to office.com/myaccount.

Method To Fix If Window Defender Service Won’t Start:

1. Disable Third-Party Antivirus:

If the user runs two antiviruses at the same time, then this will cause various issues. It is advised you should use dedicated software removal tools to remove third-party antivirus files.

2. Install Latest Windows Updates:

First of all, you need to press Windows Key + I at the same time in order to open the Settings app. Now, you have to visit to Update & Security section. At last, you need to tap on Check for updates button.

3. Run SFC Scan:

You need to press Windows Key + X altogether in order to open Win + X menu. After this, you should select Command Prompt (Admin) or Powershell (Admin). If Command Prompt opens, then you need to enter the command and tap on Enter key:

sfc /scannow

Now, SFC scan will start scanning. The scanning process will take 15 minutes, so you should interrupt in between.

4. Clean your Registry:

If there are issues with your registry, then also Windows Defender won’t start. Because corrupt registry entry can cause this issue and hence, it is advised you should remove the problematic entry. For this, you can use special software like CCleaner for it. For more info, hit on office.com/setup.

5. Check your Environment Variables:

For this, you need to press Windows Key + S together and then enter advanced system settings. After this, you need to select View advanced system settings from the menu. Then, you need to click on Environment Variables button. Here, you should locate %ProgramData% variable and then check if it’s set to C:ProgramData. If it is not set, then you should change the variable accordingly.

6. Change System Permissions:

First of all, you should navigate to the following directory:


After this, you need to locate the Microsoft directory and then right-click on it. Now, you should select Properties from the menu. Then, you need to go to the Security tab and then hit on Advanced option. At this point, you need to remove all inherited permissions. At last, you need to save the changes and then check if the problem is resolved or not.

7. Create New User Account:

First, you need to open the Settings app and then go to the

Accounts section. After this, you should visit to Family & other people on the menu which is located on the left. Then in the right side, you need to click on Add someone else to this PC. Here, you need to tap on I don’t have this person’s sign-in information. At this point, you should select Add a user without a Microsoft account. At last, you need to enter the specific user name and then click on Next.

The above method will help you to fix Window Defender Service Won’t Start on Window 10. For more details, the customer can visit to the site of Microsoft through www.office.com/setup.