A good free antivirus

Bitdefender FREE it has the best detection engine on the market.
https://www.bitdefender.com/solutions/free.html


Lightning-fast free antivirus
Bitdefender Antivirus Free Edition is blazing fast, free to use, and loaded only with the bare-bones protection features that every computer needs.

Installs in seconds, runs at max speed without slowing down your PC
Good for gaming, image and video editing, and resource-intensive applications
Powerful protection packed into a light solution