Checklists for software errors, setup, and tool workflows.

Fix Windows Update Stuck on 'Checking for Updates' Due to DNS

If Windows Update gets stuck on 'Checking for updates' for minutes or hours, DNS issues are a com...

Windows Defender Authentication Failed: Step-by-Step Checklist

You open Windows Security and see 'Authentication failed' when trying to use Windows Defender. Th...

Fix Outlook High CPU Usage Caused by Antivirus Scanning

Symptoms and Likely Cause

You notice Outlook consuming 50% or more CPU, making your syste...

Windows Security Antivirus Not Detecting Threats: How to Fix

If you suspect Windows Security (formerly Windows Defender) is not detecting threats, you might s...

Fix Windows Defender Service Authentication Failed Error

You might see the error 'Windows Defender service authentication failed' when trying to open Wind...

Fix Windows Defender Sync Issues with Microsoft 365

When Windows Defender fails to sync with Microsoft 365, you might see alerts like "Can't connect ...