Fix 'Security Module Not Found' in Windows Defender
If you see a message in Windows Security that says something like "Security module not found" or ...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Windows Activation Error 0x80070005: File Locked
When activating Windows, you might see error 0x80070005 with a message that a file is locked. Thi...
Fix Command Prompt Version Mismatch on Windows 10
When you open Command Prompt and see a message about a version mismatch—or commands behave unexpe...
How to Fix PowerShell Authentication Failed Error
When you see an "Authentication failed" error in PowerShell, it usually means the system couldn't...
Fix OneDrive Sync Error 0x8004def5
OneDrive error 0x8004def5 usually appears when the sync client can't authenticate or connect to M...
How to Fix a File Locked by Windows Security in Windows 10
You try to open or run a file, and Windows Security blocks it with a message like "Windows protec...
Topic paths
Quick titles
Windows Activation Troubleshooting ChecklistResolve Chrome Cache Issues in Windows 10Troubleshooting Chrome Invalid ConfigurationTroubleshooting Chrome Extension Access DeniedResolve Error 0xc004f074 on WindowsHow to Set Up Remote Desktop on macOS to WindowsFix Windows Certificate Not Trusted ErrorHow to Resolve OneDrive Error 0x8007016a