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

Fix 'Windows Defender Not Recognized' Error in Command Prompt

Fix Microsoft Store App Not Opening on Startup After Update

After a recent Windows update, you might find that certain Microsoft Store apps—like Mail, Calend...

BitLocker Recovery Key on Ubuntu: How to Access Encrypted Drives

You're on Ubuntu, and a Windows BitLocker-encrypted drive is prompting for a recovery key. This i...

Fix Putty Connection Refused Due to Windows Firewall

You're trying to SSH into a remote server using Putty, but you get a 'Connection refused' error. ...

Fix Error 0x80070643 Windows Update Permission Denied

You see error 0x80070643 when trying to install Windows updates, often accompanied by a message a...

Windows Defender Not Working After Update: Checklist

After a Windows Update, Windows Defender (now called Microsoft Defender Antivirus) may stop worki...