Researchers at the University of Liverpool have created a computer virus that can spread via Wi-Fi as efficiently as the common cold infects humans. Michelle Starr Science editor Michelle Starr is ...

So always use a virus scanner. Okay, that's not an exact quote, but you get the point. Virus scanners, if kept updated, are extremely effective in keeping your computer safe from harm.

Computer security technologists are racing to find ways to block ever-more complex computer worms and viruses that burrow into computers -- usually via e-mail -- and wreak havoc on network systems.