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

Windows 11 Activation Error: Product Key Blocked – Fixes

You see “Product key blocked” during Windows 11 activation. This usually means the key is tied to...

Fix Nginx 502 Bad Gateway for WordPress

If you see a 502 Bad Gateway error when visiting your WordPress site running on Nginx, it usually...

Windows Defender 404 Not Found: How to Fix Missing Interface

You open Windows Security, click on Virus & threat protection, and get a blank page or a 404 erro...

Fix Chrome Profile Download Not Starting on Windows

You click the profile download link in Chrome, but nothing happens—no download starts, no error m...

Fix Chrome ERR_TUNNEL_CONNECTION_FAILED When Using VPN

Fix BitLocker 'Path Not Found' in Command Line

When you run BitLocker commands like manage-bde or repair-bde from an e...