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

Fix 'Permission Denied' When Running Windows Update Offline Installer

When you try to run a Windows Update offline installer (typically an .msu file) and get a 'permis...

Fix Microsoft Teams Modern Authentication Failure

When Microsoft Teams shows 'We couldn't sign you in' or 'unable to authenticate with modern authe...

Fix Windows Update Service Not Running on Startup

If your PC gets stuck in an automatic repair loop and the Windows Update service is not running o...

Fix Windows Defender SSL Certificate Errors from Antivirus Interference

You might see SSL certificate errors in your browser or applications even when the certificate is...

Fix 'Port Already Allocated' Error in Windows Defender on Windows 10

You may see an error like "Windows Defender Firewall cannot use port X because it is already allo...

How to Fix Microsoft Teams 404 Not Found Permissions Error