Checklists for software errors, setup, and tool workflows.

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Fix 'Port Already in Use' Error with Windows Defender Firewall

You try to start a local service or application, and it fails with an error like 'port already in...

Windows Defender Rate Limit Error Troubleshooting Checklist

You might see a Windows Defender rate limit error when scanning files or updating definitions. Th...

Fix Windows Defender Security Center Not Opening

When you click the Windows Defender Security Center icon or try to open it from Settings, nothing...

Fix 'Permission Denied' Error on Windows Update Migration Folder

After a Windows feature update, you may encounter a 'permission denied' error when trying to acce...

Fix Windows Update Configuration Failed Rollback Changes

You start a Windows update, watch the progress bar, and then see: "Configuration failed. ...

Jupyter Kernel Not Starting Python Environment: Fixes
You launch a Jupyter notebook, select your Python environment kernel, and the notebook stays stuc...