Fixing Windows Security Proxy Configuration Issues
When Windows Security (formerly Windows Defender Security Center) can't update virus definitions ...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Windows Update Error 0x80070020: Port Already Allocated
When you see error 0x80070020 during a Windows Update, it usually means a program is already usin...
Fix Remote Desktop 502 Bad Gateway & Gateway Timeout
If you're seeing a "502 Bad Gateway" or "Gateway Timeout" when trying to connect to a remote desk...
How to Locate the Activation Log File in Windows 10
If Windows 10 activation fails or you see a cryptic error code, the activation log file often con...
Fix Windows Activation Error 0x80070002 (Dependency Conflict)
You try to activate Windows and get error 0x80070002. The message often says something like “depe...
Fix Windows Security Error 0x80073b01: Step-by-Step Guide
You try to open the Windows Security app and get error code 0x80073b01. The app may crash or refu...
Topic paths
Quick titles
How to Fix Windows Defender Blank Screen in Windows 10Troubleshooting Yarn Install Timeout on WindowsFix Task Scheduler Access Denied – Step by StepWindows 10 Update 502 Error TroubleshootingNetwork DNS Error After BitLocker UnlockFix Windows Defender Dependency Configuration ErrorsHow to Fix Microsoft Teams Error Code CXA20001How to Fix Remote Desktop Authentication Failed on Windows 10