
Fix 'Windows Security App Not Installed' on Windows 10
You open the Start menu, search for Windows Security, and nothing shows up. Or you see a message ...
Software troubleshooting desk

You open the Start menu, search for Windows Security, and nothing shows up. Or you see a message ...

You open OneDrive and see an error like “Your OneDrive configuration is invalid” or “OneDrive can...

If you recently changed your network—switched Wi-Fi networks, moved from Ethernet to Wi-Fi, or ch...

If you see the message “Command Prompt has been disabled by your administrator” when trying to op...

If Windows Defender won’t open—whether it crashes, shows a blank window, or does nothing when you...

If Outlook is stuck on 'Updating Inbox' or shows sync errors, enabling the built-in log file can ...