Clark never opens an e-mail if he doesn’t recognize the sender. He misses some e-mails that way, but he’d much rather that happen than get a virus. And getting a virus is happening to a lot of people in the wake of the London terrorist bombings. The e-mail is entitled “Terror Hits London,” and people are opening it because it appears to have footage of the terrorist attacks. But what it really does is attack your system, which is called a “Trojan Horse” program. Clark is appalled that someone would use the tragic deaths of people to infect unsuspecting users’ computers. But it’s happening. And what you need to remember is to never open attachments from someone you don’t know. Even if you know the person, it may not be a good idea to open the e-mails. And, if you use Outlook as your e-mail client, there is a setting you can change so that the program does not automatically open attachments. That’s how some computers are getting infected. So, do what you can to prevent it.