Knowledge base for software setup, errors, and daily tool work.

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 Not Working After Update: Checklist

After a Windows Update, Windows Defender (now called Microsoft Defender Antivirus) may stop worki...

Windows Defender Real-Time Protection Error 0x80070422 Fix

You try to turn on Windows Defender real-time protection, but you get error 0x80070422. This usua...

Windows Security 404 Not Found: Setup and Fix Guide

When you open Windows Security (formerly Windows Defender) and see a blank page or a '404 Not Fou...

How to Fix BitLocker Module Not Found or Permission Denied Errors

Fix Windows Activation Token Expired via Command Line

If you see a message that your Windows activation token has expired, the system may refuse to act...