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

Windows 11 Activation Error: Product Key Blocked – Fixes

You see “Product key blocked” during Windows 11 activation. This usually means the key is tied to...

How to Fix PowerShell Not Opening on Windows 10

You click the PowerShell icon or type 'powershell' in the Start menu, but nothing happens—no wind...

Fix Outlook Access Denied in Shared Mailbox

When you see 'Access Denied' in Outlook while trying to open a shared mailbox, it usually means p...

Fix Outlook High CPU Usage Caused by Antivirus Scanning

Symptoms and Likely Cause

You notice Outlook consuming 50% or more CPU, making your syste...

Fix Windows Defender Threat Service Not Running Error

You open Windows Security and see a yellow warning: “Threat service has stopped. Restart it now.”...

Fix Firefox Secure Connection Failed Certificate Errors

You try to open a website in Firefox and see a full-page error: "Secure Connection Failed" with a...