On a personal level, installing a quality antivirus, such as Avira, Avast, or Norton is crucial to protect the integrity of ones data. Equally important is controlling access to your devices. For example last year, while working overseas a friend installed pirated software on my laptop. To do this, they disabled most of the functionality of my computer's antivirus, effectively compromising my system, giving me no end of security related problems. So my advice after chooses quality antivirus and firewall, you must think smart, that is be extremely careful about who you allow to access your device or else you may find your data compromised and yourself to replace your said device sooner than expected.