Why the hell do you have so many desktop icons. Thats tacky, clean it up. There should be zero desktop icons.
right click on the desktop, and go to properties....if you just look around there, there is a tab for like screen saver, and to the right of that, there should be a tab which has color options. Just kinda mess around with it, and you'll figure it out.
Maby if this was my comp, only i went on it, it would have zero icons... but no.. i cant have it my way... Nothing goes my way....
Start Menu > Control Panel > Advanced > Performace box click Settings > Adjust for Best Appearance > Click Apply and that should make the boxes go away for you.