My parents dont`s use their pc very much, only visit a few websites a day. Nevertheless the regularly have rootkits on their pc. They only visit websites such as newspapers and a known dutch trade site. Is it possible that someone sends them these rootkits as they have a fixed ip? What can I do to prevent it? The pc is protected with a known free av and firewall. They are up to date and I asked them to use Firefox . Thank you.