ok guys, this is the problem... the thing is that ussually the alerts apeared in a small box in bottom right side of my screen, but few days ago my uncle turned on the computer (in a normal way) and he told me that the screen was black, only the icons of the things that i have appeared (like the internet, my documents, and other things) and the alert was no longer in a small box, it was in the screen, as if I added the warning as a desktop image, and everytime i choose a diferent picture, the warning is still there, over the image, and when i turn off my computer and turn it back on, the image i saved as a desk top disapeared, and it was all black, with the normal icons and the warning..... why is this happening? If someone has the answer please tell me.