Everyone who owns a PC or Mac should be running some kind of antivirus software. Oh, I know Macs and PCs running Linux are safe than Windows-based systems but is it worth taking the risk for bragging rights?

This is a tutorial video showing the new AVG Free 9.0, the latest edition of one of the long-running free security suites.

You have lots of options when it comes to security software, but all the different offerings can be divided into free and paid-for programs. AVG is one of the free ones and is highly rated along with MSE, Avast, and Avira.

One of the dangers of downloading antivirus software is being caught out by cyber-crooks and downloading a version that is itself loaded with malware. So always stick to sites you know you can trust, such as download.cnet.com.