Windows Security Invalid Configuration Checklist
You open Windows Security and see a message about an invalid configuration. This usually means a ...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listHow to Fix Windows Security Rate Limit Error
You may see a Windows Security rate limit error when trying to open the app or run a scan. This o...
Windows Defender Setup Checklist for New PC
When you set up a new PC, Windows Defender (now called Microsoft Defender Antivirus) is already a...
Windows Security Slow Performance Checklist
If Windows Security (formerly Windows Defender) is making your system feel sluggish—slow scans, d...
How to Fix Windows Defender Not Starting Automatically
If Windows Defender (Microsoft Defender Antivirus) isn't starting automatically when you boot you...
Fix 504 Gateway Timeout After Windows Update
After installing a recent Windows update, you might see a 504 Gateway Timeout error when browsing...
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