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

Fix Windows Search Not Finding Files in a Folder

You open a folder, type a filename into the search box, and Windows returns nothing—even though y...

How to Fix Cloudflare DNS Not Resolving on Windows

You've set your Windows machine to use Cloudflare DNS (1.1.1.1 and 1.0.0.1), but websites won't l...

Fix 'Permission Denied' When Opening System32 in Command Prompt

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 Remote Desktop Invalid Configuration Errors

When you try to connect to a remote desktop and see an 'invalid configuration' error, the session...

Fix Windows Defender Not Starting After Update

After a Windows update, you might see that Windows Defender (now called Microsoft Defender Antivi...