Windows Defender won't open? Here's how to fix it! (Windows …
Feb 16, 2022 · Win 11 was asking me to find the app in Windows Store when I tried to run Windows Security. I did the PowerShell work entries above, which kicked off a lot of execution …
Windows Defender Won’t Start in Windows 10/11 Fix - The …
Oct 7, 2025 · There are several reasons behind Windows Defender not working in Windows 10 OR Windows 11, but it’s hard to pinpoint what exactly is the reason. Here, we have compiled a …
Windows Security Not Opening? Step-by-Step Defender Repair …
Aug 30, 2025 · Windows Security failing to open is a deceptively common problem that can leave a PC exposed and users unnerved — yet in almost every case the root causes and remedies …
Windows Defender Won't Open | Quick Fix Guide
When the Windows Security interface refuses to launch, the goal is simple: get the app and its services back online without a full reinstall. This guide walks through quick checks first, then …
8 Ways to Fix Windows Defender Not Working/ Opening [Tested]
Oct 23, 2025 · If Windows Defender is not working, remove your third-party antivirus or run the Troubleshooter from Windows Settings.
Windows Security not opening or working in Windows 11
Sep 2, 2025 · There can be many reasons why you may not be able to turn on Windows Defender. The list includes the presence of another security software, misconfigured date and …
FIX: Windows Security Not Working in Windows 11. - wintips.org
May 10, 2024 · In this article, you'll learn what might be preventing Windows Defender from starting, and then we'll show you step-by-step how to fix the problem: Windows Defender …
How to Fix Windows Security Not Opening in Windows 11
Dec 1, 2025 · Recommended: Download Windows Speedup Tool to quickly fix PC issues. Windows Security (formerly Windows Defender) is one of the most important components of …
Fix: Windows Defender won't open in Windows 11
Oct 1, 2025 · If you are trying the latest preview builds of Windows 11 and you realize that Windows Defender won’t open, this article is for you. In this article, we will see how you can fix …
Windows Security (Defender) app won’t open after Windows 11 …
Oct 2, 2025 · I upgraded from Windows 10 to Windows 11 and since then the Windows Security app (Defender UI) will not open. When I try to open it from Start or Settings, nothing happens.