Windows Defender Service Troubleshooting Checklist
If Windows Defender won't start, won't update, or shows error messages like "Service stopped" or ...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listHow to Fix Microsoft Store Not Opening on Ubuntu
You installed the Microsoft Store on Ubuntu via Wine or a compatibility layer, but it won't open....
Fix Windows 10 Sign-In Loop When Searching
You search for something using the Start menu or taskbar, and instead of results, you get a promp...
Fix Windows Defender Crash Loop in Windows 10
If Windows Defender keeps crashing and restarting on your Windows 10 PC—showing error messages, d...
Fix Windows Search Dependency Conflict Sync Issues
You open Windows Search and nothing happens, or sync keeps failing. Often the culprit is a depend...
Fix Git Clone SSH Permission Denied (Publickey) on Windows
You try to clone a Git repository over SSH on Windows and get Permission denied (publickey)...
Topic paths
Quick titles
Microsoft Store File Locked Error: 0x80070005 FixWindows 11 BitLocker Slowdown: Causes and SolutionsWindows Update 0x8024402c Configuration FixFix Remote Desktop Service Not Running on WindowsTroubleshooting Command Prompt 502 ErrorResolve Windows Update Stuck at 100 PercentHow to Fix Chrome SSL Protocol ErrorTroubleshoot Error 0x80070422 in Windows Security