I removed my dual boot in 2009, so the last windows I used on a personal computer was Vista. I switched my close family (parents and even my grand mother) to Linux years ago, nevertheless I still am the tech-savyy go-to person for other people and I am completely disconnected from what's going on the Windows world. Is an antivirus still needed there? Are there some good tools that should always be installed on a computer? The only thing I usually do is to put as many free software as I can (Firefox, Thunderbird, LibreOffice, VLC, Gimp...) But then what ?