In this video, you will learn how to fix the “Can’t open Windows Security” issue and get it working again in Windows 11 or Windows 10. If your Windows Security app won’t launch, opens and closes immediately, or shows a blank screen, this guide provides a quick and proven solution using a simple PowerShell command. br br ✅ WORKING COMMAND: br br Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage br br This method repairs the Windows Security app and resolves common problems like: br br Windows Security not opening br br Security Center not working br br Windows Defender won’t launch br br Virus & threat protection not loading br br Windows 11 security issues br br Windows 10 protection settings missing br br No third-party tools needed — just built-in Windows features! br br 📌 Keywords for better search visibility: br Fix Windows Security not working, Can't open Windows Defender, Windows Security not launching, Reset Windows Security app, Windows 11 security fix, Windows 10 virus threat protection, Microsoft.