Restart your computer to resolve temporary glitches. 2. Run the Windows Security Troubleshooter via Settings > System > Troubleshoot. 3. Ensure Security Center, Windows Defender Antivirus Service, and Windows Firewall are set to Automatic and running in services.msc. 4. Re-register the app using PowerShell with Reset-AppxPackage Microsoft.SecHealthUI, or reinstall it via AppXManifest.xml. 5. Run sfc /scannow and DISM /Online /Cleanup-Image /RestoreHealth to fix system file corruption. 6. Boot into Safe Mode and scan for malware using a trusted antivirus tool. 7. Create a new user profile to check if the issue is profile-specific. 8. Install pending Windows updates to resolve compatibility issues. Most issues are caused by stopped services, app corruption, or system damage, and following these steps typically restores Windows Security functionality completely.
If Windows Security isn’t opening on your Windows 10 or Windows 11 PC, it can leave you feeling exposed and frustrated—especially when you need to check your antivirus status or firewall settings. The good news is that this issue is usually fixable. Here’s a step-by-step guide to get Windows Security working again.

1. Restart Your Computer
Before diving into complex fixes, try the simplest one first:
- Restart your PC.
Sometimes, a temporary glitch or background process conflict prevents Windows Security from launching. A reboot can clear this up instantly.
2. Run the Windows Security Troubleshooter
Windows includes built-in troubleshooters that can detect and fix common issues.

Steps:
- Press
Win I
to open Settings. - Go to System > Troubleshoot > Other troubleshooters.
- Find Windows Security and click Run.
- Follow the on-screen instructions and apply any recommended fixes.
This tool often resolves issues related to corrupted components or service interruptions.

3. Check if Security Services Are Running
Windows Security relies on several background services. If they’re disabled or stopped, the app won’t open.
Steps:
- Press
Win R
, typeservices.msc
, and press Enter. - Look for these services:
- Security Center (or Security Health Service)
- Windows Defender Antivirus Service
- Windows Firewall
- For each:
- Double-click it.
- Set Startup type to Automatic.
- If the service isn’t running, click Start, then Apply.
Restart your computer after ensuring all are running.
4. Re-register Windows Security via PowerShell
The Windows Security app is a modern UWP app. Re-registering it can fix launch issues.
Steps:
- Right-click the Start button and select Windows Terminal (Admin) or PowerShell (Admin).
- Paste the following command and press Enter:
Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage
Wait for it to complete (no output means it worked).
Then try opening Windows Security again via Start menu or Win I
> Privacy & security > Windows Security.
? If that doesn’t work, reinstall it instead:
Get-AppxPackage -AllUsers Microsoft.SecHealthUI | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register "$($_.InstallLocation)\AppXManifest.xml"}
5. Scan for System File Corruption
Corrupted system files can prevent Windows Security from launching.
Run these commands in Command Prompt (Admin):
sfc /scannow
Wait for it to finish (can take 15–20 mins). If it finds and fixes issues, restart.
Then run:
DISM /Online /Cleanup-Image /RestoreHealth
This repairs the Windows image. Restart again after completion.
6. Check for Malware
Some malware disables security tools to avoid detection.
- Boot into Safe Mode with Networking.
- Run a full scan using a trusted antivirus (like Malwarebytes or Microsoft Defender Offline).
- Remove any threats found, then restart normally.
7. Create a New User Profile
Sometimes, the issue is tied to your user profile.
- Create a new local administrator account:
- Go to Settings > Accounts > Family & other users > Add account.
- Log into the new account.
- Try opening Windows Security there.
If it works, the problem is with your original profile—consider migrating data or fixing profile corruption.
8. Update Windows
Outdated system components can cause compatibility issues.
- Go to Settings > Windows Update.
- Install all pending updates.
- Restart if needed.
Microsoft often pushes fixes for known bugs in cumulative updates.
Bottom line: Most Windows Security launch issues come from stopped services, app corruption, or system file damage. Start with the troubleshooter and services, then move to PowerShell and system scans if needed.
Basically, it's not usually serious—but it’s worth fixing quickly to keep your system protected.
The above is the detailed content of How to fix Windows Security not opening. For more information, please follow other related articles on the PHP Chinese website!

Hot AI Tools

Undress AI Tool
Undress images for free

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

When logging into iTunesStore using AppleID, this error saying "This AppleID has not been used in iTunesStore" may be thrown on the screen. There are no error messages to worry about, you can fix them by following these solution sets. Fix 1 – Change Shipping Address The main reason why this prompt appears in iTunes Store is that you don’t have the correct address in your AppleID profile. Step 1 – First, open iPhone Settings on your iPhone. Step 2 – AppleID should be on top of all other settings. So, open it. Step 3 – Once there, open the “Payment & Shipping” option. Step 4 – Verify your access using Face ID. step

So, you took some great photos at your last party, but unfortunately, most of the photos you took were of red eyes. The photo itself is great, but the red eyes in it kind of ruin the image. Not to mention, some of those party photos might be from your friends’ phones. Today we'll look at how to remove red eye from photos. What causes the red eyes in the photo? Red-eye often occurs when taking photos with flash. This is because the light from the flash shines directly into the back of the eye, causing the blood vessels under the eye to reflect the light, giving the effect of red eyes in the photo. Fortunately, with the continuous advancement of technology, some cameras are now equipped with red-eye correction functions that can effectively solve this problem. By using this feature, the camera takes pictures

A Comprehensive Guide to PHP 500 Errors: Causes, Diagnosis, and Fixes During PHP development, we often encounter errors with HTTP status code 500. This error is usually called "500InternalServerError", which means that some unknown errors occurred while processing the request on the server side. In this article, we will explore the common causes of PHP500 errors, how to diagnose them, and how to fix them, and provide specific code examples for reference. Common causes of 1.500 errors 1.

1. Press win+r to open the run window, enter [regedit] and press Enter to open the registry editor. 2. In the opened registry editor, click to expand [HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun]. In the blank space on the right, right-click and select [New - String Value], and rename it to [systray.exe]. 3. Double-click to open systray.exe, modify its numerical data to [C:WindowsSystem32systray.exe], and click [OK] to save the settings.

Airplane mode is very convenient in some situations. However, the same airplane mode may give you a headache if your iPhone suddenly gets stuck on it. In this article, we have designed this set of solutions to get your iPhone out of airplane mode. Quick fix – 1. Try disabling Airplane Mode directly from Control Center. 2. If you are unable to disable Airplane Mode from Control Center, you can disable Airplane Mode directly from the Settings tab – If these tips don’t work, follow the fixes below to resolve the issue. Fix 1 – Force Restart Your Device The process of force restarting your device is very simple. All you have to do is follow these step-by-step instructions. Step 1 – You can start the process by pressing and releasing the Volume Up button. step

How to fix the 0x00000024 blue screen error is one of the common errors in the Microsoft Windows operating system. The 0x00000024 error code represents NTFS_FILE_SYSTEM, which means that the operating system cannot correctly access a file in the NTFS file system. When the 0x00000024 blue screen error occurs, there are some methods we can take to fix it. This article will explore some solutions. First, we can try to restart the computer. Sometimes, the error is only temporary

Recently, some Win11 users have reported to the editor that when opening the edge browser, there will always be no response, making the browser unusable. What should I do? How to fix this problem? The editor below will bring you the solution to the problem that the edge browser is unresponsive and cannot be used. Come and try it. The method is as follows: 1. Click Start in the lower left corner of Windows 11 and open "Settings". 2. After entering Windows settings, click "Apply". 3. Then click "Apps and Features" in the left taskbar. 4. Find the browser in the open list and click "Advanced Options"

What to do with computer blue screen code 0x000007b. The blue screen error code is one of the problems that computer users often encounter. When we are using a computer and a blue screen suddenly appears with error code 0x000007b, we may feel confused and at a loss. So, how to deal with this situation? This article will introduce some common solutions to help you solve the blue screen problem on your computer. First, we need to understand the meaning of blue screen code 0x000007b. This code is usually associated with problems when the computer starts up. It may indicate a hardware failure
