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Error Message: “You’ll Need a New App to Open This Windows Defender” When Pressing a Button within Windows* Security

Content Type: Troubleshooting   |   Article ID: 000091062   |   Last Reviewed: 07/07/2023

Environment

Operating System

Windows 11* Family

Description

  • Pressing the buttons on Windows Security shows the error message "You’ll Need a New App to Open This Windows Defender"
  • Time: Cannot sync. Only a steady info saying that: "Last successful time synchronization: 01-Aug-15 7:00:00 AM
  • Cannot access Windows Security

Resolution

Microsoft Defender Security Health User Interface (UI) must be reset. Below are the steps to reset the software: 

  1. On the search bar, type in PowerShell
  2. Right-click the PowerShell icon and select Run as Administrator
  3. Type Get-AppxPackage Microsoft.SecHealthUI -AllUsers | Reset-AppxPackage