5 Ways to Fix Windows Defender Crashing in Windows 11/10

windows defender crashing

Readers should not take it lightly. When Windows Defender is crashing in Windows 11/10 PC. Microsoft re-packed the traditional security solution and named it Windows Security. Millions of computers have third-party security solutions installed on the PC, but you should not forget that Windows Defender is the first layer of security. Users have shared the story that Windows Defender crashing. When launching the program. We cannot blame a single feature or system, and we have to address the issue by applying the solutions.

The Main Reason Windows Defender Keep Crashing in Windows 11/10?

Windows Security is an integral part of the Windows PC and is the first layer of security. You should not let it slip, as it is an indication that something is hitting the machine.

I have written a few reasons why Windows Defender is crashing in the system when it opens. You should not miss a single point, and I have given you good reasons to prevent it from happening again.

Software Bug:

A software bug in the Windows preview build broke the operating system and said “You will need a new app to this Windows Defender link” on the Windows 11 PC. Windows 10 (2004 build version) faced similar problems, and I reduced the update to the build version to 1903. Software malware may trigger a Windows Defender crashing issue, but you should take immediate action.

Windows Pirated:

Unfortunately, the Windows product key is an expensive deal, and I’m related to many free users. However, Microsoft made the wise decision to use the “free version” back in 2015 with the Windows 10 edition. Many users have ignored the “free version” and installed a pirated Windows version on their systems instead.

Windows Threats:

By 2020, Windows software detected 200 million pieces of malware. A malicious computer malware infected the system and crippled the security system to keep the software at risk. I recommend students re-install the operating system over a non-computer program, and that is how I always solved the issue.

Windows Corrupted System Files:

Do not think that Windows does not deal with software corruption. I have encountered a problem over the years. I have shown you how to scan the system to find corrupted files and provide an effective solution that I follow myself.

Third-Party Antivirus Solution:

Windows Defender was a unique retailer back in the day. The world came to a head, and Microsoft accepted Windows’ security flaws and adopted third-party anti-virus protection in the system. Windows Security provides an obligation to the antivirus system. Anyway, I’ll show you how to allow periodic scanning on a PC so you don’t have to rely on third-party antivirus.

5 Ways to Fix Windows Defender Crashing in Windows 11/10

I urge readers to reinstall the Windows OS using the ISO file downloaded from the official site. Do not install pirated Windows and programs, as there are other options available on the web market, and you should check them out.

Windows10/11 does not require you to enter a product key and you only lose “Personalization” features.

Try the Xtreme Download Manager (open source) when using the Internet Download Manager pirated version.

However, you should switch to the official Windows OS and stop using the pirated OS for the rest of your life.

Solution 1. Fix Corrupted Windows System Files

Microsoft’s operating system suffers from system file corruption, which is one of the major causes of the failing Windows Defender. Fortunately, MS has equipped the software with inbuilt tools, and you can install them to check the integrity of the system files.

Step 1. Open Command Prompt from the search bar and run as administrator.

defender crashing

Step 2. Enter the command (sfc / scannow) and press the “Enter” button.

windows defender

Step 3. Authentication begins in the Windows machine.

windows defender crashing pc

You should wait at least 10 to 20 minutes, and you can monitor the scanning process.

Step 4. The system does not have any corrupted file systems.

windows defender crashing windows 10

Results may vary. Then copy the result to the Command Prompt. Windows should be reinstalled if the result is “Windows Resource Protection detected corrupt files but could not repair some of them.”

I had a Windows PC installed on a hard disk, and the scanning process took approximately twenty minutes to complete. I upgraded the storage, and the fast SSD completed the scanning process within ten minutes. We need to consider the back-end resources and CPU performance of a single core.

However, do not interrupt the System File Checker tool and let it run.

Solution 2. Disable Antivirus System

windows defender malwarebytes combo

Almost everyone has an antivirus program on their Windows PC. I do not recommend users disable the security system as it leaves the computer at risk. It is a dangerous bet, but I will leave this judgement in your responsible hands. Windows has developed software that is integrated with third-party security solutions.

Solution 3. Uninstall Windows Feature Update

Microsoft has made mistakes in the past, and they have released feature updates that affected performance. Fortunately, the software has no limitations and allows users to download feature updates from the PC. Create a restore point so you can return to the previous point if things go wrong.

Step 1. Press the Windows key and open “Settings” on the PC.

Step 2. Find “Recovery” under System and open it.

windows defender crashing

Step 3. Find “Advanced startup” and click on the “Restart now” option.

uninstall windows feature update

Step 4. Click on the “Restart now” option.

uninstall windows feature update

Windows 10/11 boots into recovery mode, and you should wait for the software to restart and load the UEFI options.

Step 5. Click on the “Troubleshoot” option.

uninstall windows feature update

Step 6. Choose the “Advanced Options” option.

uninstall windows feature update

Step 7. Select the “Uninstall updates” option.

uninstall windows feature update

Step 8. You have two options; click on “Uninstall feature update.”

uninstall windows feature update

Step 9. Click on “Uninstall feature update.”

uninstall windows feature update

et Windows recovery mode takes care of the whole process, and you have to wait patiently until then. Do not force the machine to shut down and let Windows work.

Solution 4. Run Full System Scan

I think the antivirus program is installed on the Windows PC. Of course, you should not run the full system scan in normal mode and switch to safer mode instead. Windows disables third-party drivers, services, and applications in safe mode. Let me show you how to switch to safe mode with Windows 10 and 11 editions.

Step 1. First, press the Windows key and open “Settings” on the PC.

Step 2. Find “Restore” under System and open it.

Step 3. Find “Advanced Startup” and click on the “Restart now” option.

Step 4. Click on the “Restart now” option.

Wait for the operating system to boot in recovery mode; it takes less than a minute.

Step 5. Click on the “Troubleshoot” option.

Step 6. Select the “Advanced Options” option.

Step 7. Choose “Startup Settings” from the menu.

run full system scan

Step 8. Click on the “Restart” button or press the Enter key.

run full system scan

Step 9. Just, press the 4 key to open “Enable Safe Mode” without networking or command prompt functions.

run full system scan

The Windows PC restarts and welcomes you at the lock screen.

Enter the lock screen and open the antivirus system installed on the machine.

Step 10. Launch a full system scan in the machine.

run full system scan

Safe mode is much faster than normal mode due to the low demand for hardware resources. You can expect an antivirus to complete a full system scan in a very short time. Don’t interrupt the antivirus scanning process and don’t force the PC to shut down.

You should consider installing the Windows OS if the antivirus system fails to open or crashed in any way. I suspect malware attacks, which happened in my case, and I resolved the issue by reinstalling the software.

Solution 5. Reinstall Windows Software

I encourage readers to re-install the Windows software. I want to suggest operating system repair, but I believe it will waste your time and energy on this process. You can install a new copy of Windows with a USB flash drive, and I have done this 100+ times in the past. I install a new copy twice a year, and it maintains the integrity of the software.

reinstall windows software

Let me give you a few heads up that none of the written tutorials or YouTube videos are to be shared with you.

1. Keep a backup copy of the data stored in a separate storage drive such as a USB flash drive or hard drive.

2. Create a bootable USB drive from a different computer because a malware program prevents Microsoft Windows 11 Installation media tool. My laptop was under attack by malware, and it also blocked Rufus.

3. Format the entire drive and don’t re-install the operating system in one partition. Delete the drive during the setup and re-create partitions.

4. Make sure you write down the Windows product key, and we have a dedicated tutorial on it. I took a photo of it and saved it in the iPhone gallery. You must upload an image to cloud storage, so you don’t lose it.

5. Get the driver’s CD or copy the manufacturer’s site link. I kept a portable computer driver page and a desktop motherboard driver page, so I never had to worry about drivers.

You can reach out to an expert or engineer in your region for assistance. An engineer may charge you a few dollars for a job, but it is worth the money.


My PC had experienced a Windows Defender crashing issue on Windows 10 in the past, and it was the malware that was causing the issue. Of course, I had corrupted system files that contributed to the problem on the other side and I installed the operating system from a bootable USB flash drive 100+ times five years ago. I’m planning to reinstall Windows 11 on the Ryzen desktop for better performance. Let us know which solutions have helped you resolve the Windows Security crashing issue.

If you have any questions or queries about this article, please comment below, and we’ll get back to you. Check more daily updates to subscribe to our Website and get informational articles and much more, etc.


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