Fix Windows Security Access Denied When Opening Settings
You click Windows Security in the Start menu or try to open Virus & threat protection, and instea...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Windows Update Configuration Failed Reverting Changes Error
You restart your PC after a Windows Update, only to see “Configuration failed. Reverting changes....
Fix PostgreSQL Connection Refused Due to Firewall
When you see psql: error: connection to server at "host" (IP), port 5432 failed: Connection...
Fix BitLocker Version Mismatch on External Drives
You plug an external drive into a different computer and see a BitLocker version mismatch error. ...
How to Clear Chrome DNS Cache to Fix Loading Errors
If you're seeing ERR_NAME_NOT_RESOLVED, ERR_DNS_FAILED, or page...
How to Fix Windows Defender Not Turning On
Windows Defender (now called Microsoft Defender Antivirus) sometimes refuses to turn on or stay o...
Topic paths
Quick titles
Fix Windows Defender Error 0x80070422: Cannot ConnectFix Apache Error 1067: Server Fails to StartTroubleshooting MySQL Connection Refused Error on Port 3306Reactivate Windows 11 After Motherboard or CPU ChangeHow to Fix 'Not Recognized' in CMDFix Maven Dependency Resolution Failed in Offline ModeWindows Security Log 4625 Failed Login TroubleshootingFix Microsoft Teams Not Opening