Fix Windows Defender Missing After Update
After a Windows update, some users find that Windows Defender is missing from the system tray, Se...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listHow to Clear Windows Defender Protection History Log
If you've ever opened Windows Security and seen a long list of past threats, you might want to cl...
Microsoft Teams Not Working After Update: How to Fix
After a Microsoft Teams update, you might find the app won't start, hangs on loading, or shows bl...
Fix Windows Defender SSL Certificate Errors After Update
After a Windows update, you might see SSL certificate errors in Windows Defender or other applica...
Windows Security 404 Not Found: Setup and Fix Guide
When you open Windows Security (formerly Windows Defender) and see a blank page or a '404 Not Fou...
Fix Windows Security Certificate Error in Outlook 365
You open Outlook 365 and see a security certificate warning: "There is a problem with the proxy s...
Topic paths
Quick titles
Windows Terminal Connection Timeout: Firewall Troubleshooting GuideFix Chrome Sync Not SyncingFix Teams High Resource UsageTask Scheduler Rate Limit Sync Issue: Causes and FixesFix Windows Update Service Stuck on StartingChrome Extension Keeps Turning Off FixSetup Guide: Fixing Command Prompt Dependency ConflictsWindows Update Stuck at 100% After Restart: How to Fix