Cyber security is increasingly something that worries me: And on a variety of levels.
Why? Simply, viruses can be gotten easy on most PCs these days (Macs, too!), and many kinds of malware can infect PCs. I reckon that’s important to:
keep backups of your documents (off system);
get and use uptodate AV software to protect (Microsoft now has a free one);
and maintain vigilance on especially new sites that you haven’t frequented.
It used to be that the main vector for contracting viruses/malware was via attachments, but if you use Google or any other webmail, you can pretty much nix that vector by NOT downloading attachments to your PC.
So now things have shifted: Drive-by Downloads seem increasingly common esp. on unpatched computer systems; malware hides in regular software, and IM (SPIM) in your messenger services all are increasingly common. Also, you may find that you get caught out by Spook (Facebook Spam). As cyber security improves, you can bet your bottom dollar that thieves, criminals, and spies will try anything new to rob us of our cash, our data, and even our identity.