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 listFix Windows Activation Error 0xc004c003 After Hardware Change
If you see error 0xc004c003 after upgrading your PC's motherboard, CPU, or other major hardware, ...
Fix Remote Desktop DNS Lookup Failed Error
When you try to connect to a remote computer using Remote Desktop (RDP) and see a 'DNS lookup fai...
How to Fix Windows Search Dependency Conflict Error
When Windows Search stops working and you see a dependency conflict error, it usually means a req...
How to Rebuild the Windows Search Index Database
If Windows Search stops returning files, returns outdated results, or takes too long, the search ...
Enable Windows Defender After Group Policy Disabled It
If Windows Defender is disabled and you suspect a Group Policy setting is the cause, you may see ...
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