Fix Windows Defender Real-Time Protection Authentication Failed
When you try to turn on Windows Defender real-time protection, you might see an error saying some...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listHow to Activate Windows with a Digital License
If you've upgraded to Windows 10 or 11 from a previous version, or bought a new PC with Windows p...
How to Fix Windows Terminal Not Opening
When Windows Terminal fails to open—no window, no error, or a brief flash—it's usually due to a c...
Configure Windows Update to Trust a Custom SSL Certificate
If you manage Windows updates in an enterprise environment, you may need to use a custom SSL cert...
Fix Windows Defender High CPU Usage with Registry Tweaks
If Windows Defender is using 30-50% CPU constantly, even when idle, it's usually due to aggressiv...
How to Fix Command Prompt Error 0x80070002 (File Not Found)
When you run a command in Command Prompt and see Error 0x80070002, it usually means ...
Topic paths
Quick titles
Microsoft Store File Locked TroubleshootingHow to Fix 504 Gateway Timeout in Windows TerminalPowerShell Cannot Connect to Proxy: Troubleshooting GuideFix Chrome Crashing on Startup in Safe ModeFix Remote Desktop Version Mismatch Between Client and ServerFix Microsoft Store Error 0x80073cf0: Invalid ConfigurationHow to Fix Microsoft Store Sign-In ErrorsFFmpeg Audio Out of Sync: Practical Troubleshooting Guide