Protect Your Computer From the "Internet Doomsday" Virus
How Can the Hackers Access My Computer?
A Domain Name System (DNS) allows your computer to communicate with DNS servers run by your Internet service provider and allows you to surf the web freely. Hackers use a combination of default usernames and passwords to break into your computer's DNS, and, if successful, they can control other devices in your home or office, such as a wireless Internet router. (Photo: REUTERS/Arko Datta)