Guides

My PC keeps crashing — a full diagnostic walkthrough

A calm, step-by-step way to find out why a Windows PC keeps crashing: crash dumps, error reports and event logs, in the right order, with free browser tools.

Is this file safe to open? A practical checklist

Someone sent you a file — an attachment, a download, a USB stick. Here is how to judge what it really is and whether opening it can hurt you, using free browser tools.

How to read an SSL certificate (without the jargon)

What all the fields in an SSL/TLS certificate mean, how to check one for problems, and how to fix the classic errors — expired, name mismatch, missing intermediate.