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

Repair Windows Security Module Registry: Step-by-Step Guide

If Windows Security (formerly Windows Defender) won't open, shows errors like "This app has been ...

Fix Windows Security Token Expired Error 0x80070520

You see error 0x80070520 with the message 'The security token has expired.' This usually happens ...

How to Fix Windows Update Not Working After Upgrade

After upgrading Windows, you may find that Windows Update stops working—errors like 0x80070002, 0...

Fix 'Port Already Allocated' with Security Permission Denied

You try to start a service or application, and you get an error like "port already allocated" or ...

Fix Windows Login Loop with CMD Repair Tool

You log in, see the desktop for a second, and get kicked back to the lock screen. This Windows lo...

Fix PowerShell Proxy Authentication Failed Errors