✔️ 2022 FIX: Windows Defender service does not start in Windows 10/11
– Reviews News
- If Windows Defender cannot be started, you are exposed to cyberattacks and viruses.
- Make sure to remove or disable any third-party antivirus solution on the device.
- Install the latest Windows and driver updates and always keep them up to date.
- You can also run a System File Checker scan and let the operating system fix the detected issues.
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Windows Defender is one of the most popular antivirus programs in the world, protecting millions of computers against vicious threads. However, many users report that their Windows Defender won't start.
Often, when users try to start Microsoft's built-in antivirus, an error message appears on the screen informing them that the service could not be started.
Many Windows 10 users reported that Windows Defender service not starting on their PC. Here are also some other similar issues reported by users. and speaking of issues with Windows Defender.
- Windows Defender service does not start Windows 10, 8, 7 – According to users, this problem can appear on all versions of Windows, including Windows 8 and 7. Even if you are not using Windows 10, be aware that almost all of our solutions are compatible with older versions of Windows, so don't hesitate to try them.
- Windows Defender service does not start error 577 – Error 577 can sometimes appear when trying to start the Windows Defender service. To resolve this problem, make sure that you don't have any third-party antivirus installed on your system.
- Windows Defender Security Center does not open: Several users reported that Windows Defender Security Center does not open at all. To resolve this issue, check if the latest updates are installed.
- Windows Defender service does not start Access Denied – This issue may appear due to issues with your permissions. To resolve the problem, you need to adjust the security permissions of the ProgramDataMicrosoft directory.
- Windows Defender service keeps stopping – If the Windows Defender service keeps stopping, the problem might be profile corruption. Just create a new user profile and check if that fixes the problem.
Windows Defender service not starting, how to fix it?
1. Disable and remove third-party antivirus solutions
Running two antivirus solutions at the same time leads to various technical issues. Use dedicated software removal tools to completely remove all third-party antivirus files.
If that doesn't fix the problem, you can always upgrade to a third-party antivirus solution. There are many great antivirus tools out there, and you should look for one that has plenty of security features.
of them. Install the latest Windows updates
- Press Windows Key + I to open the Settings app.
- go now to Update and security section.
- Click Check for updates button.
Windows will now check for available updates and download them in the background. Once the updates are downloaded, simply restart your PC to install them.
Sometimes you may be able to fix the Windows Defender service does not start just install the latest updates. Keeping your system up to date will ensure that everything is running smoothly on your PC.
Windows 10 usually automatically downloads necessary updates in the background, but due to some bugs, you might miss an update or two.
3. Run an SFC scan
- Press windows key +X to open the Win + X menu. Now select Command prompt (administrator) Is powershell (administrator).
- When System symbol opens, type the following command and press Enter: sfc /scan now
- Now the SFC scan will start. The scan may take up to 15 minutes, so please do not interrupt it.
According to users, sometimes Windows Defender service fails to start due to file corruption. Your system files may be corrupted and this may cause this error to appear.
Once the scan is complete, check if the problem still persists. If the problem persists or if you were unable to run the SFC scan at all, you can try running the DISM scan instead.
- Open System symbol as administrator
- When System symbol opens, enter the following command: DISM /Online /Cleanup Image /RestoreHealth
- The DISM scan will now begin. The scan can take up to 20 minutes, sometimes longer, so be patient and don't interrupt it.
After the DISM scan is complete, check if the issue still occurs. If the issue still persists or you were unable to run the DISM scan earlier, make sure to repeat the SFC scan and check if that fixes the issue.
4. Clean your registry
Sometimes he Unable to start Windows Defender if there are any problems with your registration. A damaged registry entry can cause this problem to appear and you need to find and remove the problematic entry.
This is a complex task to perform manually, so it is better to use special software for this. There are many excellent registry cleaners available that can help with this problem.
To find the right option for this task, you can opt for effective registry cleaning tools that remove residual files and optimize your PC.
5. Check your environment variables
- Press Windows key + S and enter advanced system settings. To select View advanced system settings from the menu.
- click now Environment variables button.
- To locate %Program Data% variable and check if it is set to C: ProgramData.
- Otherwise, modify the variable accordingly.
Environment variables are a useful feature that your system uses to access certain directories.
However, sometimes users or maybe third party applications can change their environment variables and cause this issue to appear.
It will make you unable to start windows defender service but you can fix your environment variables manually by doing the following:
After making these changes, the issue should be resolved and Windows Defender should start working.
6. Modify system permissions
- Go to the following directory: C: ProgramData
- Now locate the Microsoft directory and right click on it. Choose Properties from the menu.
- Now go to Safety tab and click Advanced.
- Now you need to remove all inherited permissions. After that, save the changes and check if the issue is resolved.
According to users, sometimes your folder permissions can cause this problem. If the Windows Defender service does not start on your PC, you may need to change its permissions.
This is an advanced walkthrough, and if you're unfamiliar with permissions, you can skip this solution.
Please note that this is a system folder and any changes to this folder may cause problems to appear. Therefore, if you are unfamiliar with system permissions, you can skip this solution.
7. Create a new user account
- Open the Application Settings And go to Accounts section.
- Go to Family & other people in the left menu. In the right pane, click Add someone else to this PC.
- Click I do not have this person's login information..
- Select now Add a user without a Microsoft account.
- Enter the desired username and click following.
If the Windows Defender service won't start, you might be able to fix the problem simply by creating a new user account.
Sometimes your user account can get corrupted which can cause this and other errors to appear. To troubleshoot a user account, follow the instructions above.
After creating a new user account, edit it and check if the issue still occurs. Otherwise, you may need to switch to the newly created account and start using it instead of the old one.
8. Upgrade in place
- Download the Media Creation Tool from the Microsoft website and run it.
- Select Upgrade this PC now.
- Wait while the installer prepares the necessary files.
- Select Download and install updates (recommended). Wait for the installer to download the necessary files.
- Follow the on-screen instructions until you reach the Screen ready to install.
- make sure of that Keep personal files and apps appears in the summary list.
- If not, click Change what to keep and select Keep personal files and apps from the list.
- Follow the onscreen instructions to complete the installation.
If the above solutions do not fix the problem, you can try performing an in-place update. This will reinstall Windows 10 but keep all your files and apps.
Once the installation is complete, you will have a clean install of Windows and the issue should be resolved.
One last thing before ending the article. If you are looking for a new antivirus tool, check out this useful list of best antivirus tools with lifetime license and take your pick.
Not being able to start the Windows Defender service can be a problem, but we hope you managed to solve this problem with one of our solutions.
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SOURCE: Reviews News
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