Degunking Your Email, Spam, and Viruses

"Everyone who works in technical support knows the feeling of dread when someone asks what they do for a living, only for an immediate response of "Oh my PC has been running slowly recently, any ideas?". This book is meant for those people who don't know their worms from their trojans, and who've been having a strange problem where they click on a link to one page, but end up at another." Source: spamfo.co.uk