Fix Windows Update Error 0x80070020: Port Already Allocated
When you see error 0x80070020 during a Windows Update, it usually means a program is already usin...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Windows Defender Error 0x80070422: Won't Turn On
If you see error code 0x80070422 when trying to turn on Windows Defender, it usually means the re...
How to Fix BitLocker Proxy Error Configuration
You're setting up BitLocker on a domain-joined Windows machine and get an error about a proxy con...
How to Fix Windows Defender Stuck on Loading Screen
If Windows Defender (Microsoft Defender Antivirus) gets stuck on a loading screen or shows a blan...
Fix Windows Update Version Mismatch Configuration Error
You see a message like "Windows Update configuration mismatch" or "version mismatch" when trying ...
Fix Windows Security Login Loop After Update
You click the Windows Security icon, it asks for your PIN or password, you enter it, and then it ...
Topic paths
Quick titles
Fix Remote Desktop Auto-Start Failing After UpdateCommand Prompt Not Working? Reset It with These StepsOneDrive Sync Timeout Fix GuideHow to Fix Defender Threat History Loading ErrorHow to Install Command Prompt Without InternetJupyter Kernel Not Starting in Anaconda: FixesFix Microsoft Teams Update ProblemsHow to Fix Windows Security Timeout Error