If you believe the American FBI, a lot of people have infected computers that are using a rogue DNS service. According to a story in the Huffington Post, hundreds of thousands of Windows PC users may be unwitting members of a hacker network but are unaware of it. The FBI is about to close down the network in July and infected computers will lose the Internet. A site at this link has been provided where international services are listed that will check your computer to see if your DNS service is compromised.
Two excellent articles by editor Remah that explain DNS servers are at this link and at this link. They are worth reading. DNS service is coming under attack more and more. DNS may seem an arcane subject but learning how to manage the service will give you more security.
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This tips section is maintained by Vic Laurie. Vic runs several websites with Windows how-to's and tutorials, including a site for learning about Windows and the Internet and a blog with computer tips and commentary.