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

SSH Permission Denied (Publickey) on EC2: Setup Fixes

If you're seeing "Permission denied (publickey)" when trying to SSH into an AWS EC2 instance, the...

How to Fix Windows Defender Setup When Version Mismatch Occurs

You try to enable or update Windows Defender, but get an error about a version mismatch. This typ...

BitLocker Recovery Key Not Accepted: Fix Authentication Failed Error

How to Fix Windows Update Error 0x80070643

You try to install the latest Windows updates but get error 0x80070643. This usually means the up...

PowerShell Slow Startup: Common Causes and Fixes

If PowerShell takes noticeably longer to start than usual—sometimes 10 seconds or more—the proble...

How to Fix Windows Security Not Opening

You click the Windows Security icon in the taskbar or open it from Settings, but nothing happens—...