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

How to Fix Windows Security 404 Not Found Error

If you see a '404 Not Found' error when opening Windows Security (formerly Windows Defender), the...

How to Force Close Windows Update Stuck at 100%

If your Windows Update is stuck at 100% for more than 30 minutes, it usually means the finalizati...

Fix Cloudflare Error 521 on Apache Server

Cloudflare error 521 means your web server (Apache) is refusing the connection from Cloudflare's ...

How to Recover a Deleted Firefox Profile Folder

If you accidentally deleted your Firefox profile folder, your bookmarks, passwords, and settings ...

How to Fix Git Fatal Repository Not Found Error

Fix PowerShell Assembly Cache Not Updating

You’ve updated a .NET assembly in the Global Assembly Cache (GAC) or copied a new DLL into a modu...