Antivirus section
Everything you need to choose, set up and use antivirus on Windows, in the order most people need it.
Start here
5 · Protect
Ransomware protection basics
Layers that protect your files, and what to do if they are locked.
Quick rules
- Run only one real-time antivirus at a time.
- Install security software only from the vendor’s official site or the Microsoft Store.
- Updates matter as much as antivirus. Keep Windows and your browser current.
- No pop-up in a web page can truly scan your PC.