It has already been spoken here on the website about WGA, which means "Windows Genuine Advantage Notification", or even "Notification of the Advantages of Windows Original". Well, in its first version released in June 2006 as a form of update, its commutator simply displayed a message that its Windows was not original. Well, this version of WGA, it's a little bit worse, besides displaying the message, he takes off his Wallpaper. This wga was released exclusively for Windows XP Professional, because given explanations that it is the most pirated version.

Below is an image of the notification:

Now an entire Desktop image:

As much as you change wallpaper, the bottom always goes back to black.

So boys and girls, the solution is to legalize your Windows, or even acquire a version of Windows Vista that suits you.

Source: WinHelp