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

How to Fix Cloudflare 521 Error (Port 443 Blocked)

When you see a Cloudflare 521 error, it means Cloudflare’s servers cannot connect to your origin ...

Fix Windows Defender Real-Time Protection Not Starting

If you see a yellow warning or a message that real-time protection is off, Windows Defender’s cor...

Chrome Startup Crash with No Error Message: Fixes That Work

Chrome crashes on startup with no error message—just a sudden close or a frozen window. This ofte...

Fix 'package.json Not Found' After Cloning a Repository

Symptom

You clone a repository from GitHub (or another remote), change into the directory...

How to Fix Black Screen After Enabling Hardware Acceleration in Chrome

You enable hardware acceleration in Chrome to improve performance, and suddenly the screen goes b...

Fix Windows 11 Update Stuck at 0% – BITS Service Issues

You click 'Check for updates' in Windows 11, and it sits at 0% for minutes or hours. Ofte...