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

Fix Microsoft Store Blank Screen When Opening an App

You launch an app from the Microsoft Store, and instead of the app window, you get a blank screen...

Fix Windows Security Authentication Error 0x80070035

Fix Windows Security Not Opening Error 0x80073cfc

When you double-click Windows Security and nothing opens, or you see error 0x80073cfc, it usually...

Checklist to Resolve Windows Defender Update Errors

When Windows Defender fails to update, you might see error codes like 0x80070643, 0x80240022, or ...

Fix Windows Defender Connection Refused via Group Policy

If you see a "connection refused" error when trying to open Windows Defender Security Center or r...