I don't use Carbonite, but this question comes up a lot. They're called the Info Windows, and here's a sticky about them: http://www.wowinterface.com/forums/s...ad.php?t=21650 I believe there is a setting to disable them, you should be able to find it now that you know what they are called.
Also, as an aside, it looks as if your linked image was taken with a camera. For future reference, the Print Screen button (sometimes labeled PrtScn) on your keyboard will take a screenshot which is then saved in your World of Warcraft\Screenshots folder.
"You'd be surprised how many people violate this simple principle every day of their lives and try to fit square pegs into round holes, ignoring the clear reality that Things Are As They Are." -Benjamin Hoff, The Tao of Pooh