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https://us.norton.com/internetsecurity-malware-pc-or-mac.html?inid=hho_nortoncom_store_internetsecurity_hp_ctrl_cat-showcase_malware-pc-or-mac
How to reduce your risk
The first thing a user can do to reduce her risk of cyber attacks, regardless of the operating system, is to install an Internet Security software suite, such as Norton Security (for both Mac and PC) on the machine. Even Macs can use the added protection these days.
Consider the use of a host-based firewall to ensure your online activities are encrypted and not seen by online assailants. Additionally, you should always be cautious of browser plus-ins and add-ons. Don’t click on pop-ups or virus warnings; many of these windows are scams and use “scare tactics” to trick users into thinking you’ve already contracted a virus. When you click the link telling you to download the software to ‘cure’ the virus, you’re opening the door for a cyber attack.