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Windows, Mac and Chromebook error codes and warnings, explained.

Computers
Mac app "can't be opened because Apple cannot check it for malicious software": what to do

Gatekeeper couldn't confirm the app comes from an identified developer and was checked by Apple. How to decide whether to open it, the supported Open Anyway route on macOS Sequoia, and when to delete it.

October 26, 2026 · 4 min
Computers
Fake virus warning pop-up with a phone number: how to close it and stay safe

A browser pop-up saying your computer is infected and telling you to call a number is a tech support scam. How to spot it, close it, and what to do if you already called or paid.

October 26, 2026 · 4 min
Computers
CRITICAL_PROCESS_DIED stop code on Windows: what it means and how to fix it

A core Windows process stopped, so Windows shut down to protect your files. What causes it, how urgent it is, and the fixes to try whether or not your PC still starts.

October 26, 2026 · 4 min