Ok, ok, let's be more helpful
A computer on the Internet is located by it's IP address, which looks something like 82.132.44.156. Now, it would be fairly difficult for you to remember the addresses of all your favourite sites, which is why you can reach them through a so-called domain name, eg
www.planetarion.com.
Now, when you type in that address in your browser, your PC will send a request to a so-called
Domain
Name
Server, which basically works as the digital variant of a phone book, in that it finds the correct IP address with the domain name you entered, and sends you there.
The error message you got, indicates that the request that your PC sent out to the DNS, wasn't correctly handled. This may indicate a problem at the DNS itself, there's nothing you can do about that but wait and/or try again