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

Microsoft Store SSL Certificate Error: Troubleshooting Checklist

You open Microsoft Store and see an SSL certificate error—maybe “ERR_CERT_AUTHORITY_INVALID” or a...

Fix Windows Activation Cannot Connect to Activation Server via CMD

When Windows fails to activate and displays "Cannot connect to activation server," it's usually a...

Fix Outlook High CPU Usage Caused by Antivirus Scanning

Symptoms and Likely Cause

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

How to Fix Windows Update Error 0x80070002

You click Check for updates and after a while get error 0x80070002. It usually means Windows Upda...

How to Fix Microsoft Teams 404 Page Not Found Error

You click a link in Microsoft Teams and see a '404 Page Not Found' error. This usually means Team...

How to Fix 'File Locked by System' in Windows Defender

If you see an error like "File locked by system" when running a Windows Defender scan or trying t...