This is my config.

I know, I know : you won't agree !

But as I am not infected often (never except once years ago),

I must admit that I am a little lax thereupon.
Thanks for your answers:)

In fact I plan to have a new computer and so to upgrade my OS at the same time.

This one is old and this is why I don't use an antivirus and want to have a light configuration.

I use it with only one other person of confidence. The only way I could be infected is by the net.