My desktop didnt have them before but i dont know what happened, each of my desktop icon has like a box background of color sumtimes orange ,now its blue..help
You have "drop shadows" disabled. This can happen when windows thinks that your computer is struggling, and turns the "drop shadows" off. (I like to think of drop shadows as transparency) To re-enable them, Go start, and right click on "my computer" Press properties, and click "advanced". Then under "performance" click settings. Scroll to the bottom of this list, and second to bottom will be a checkbox with something about drop shadows on it. Make sure that this is ticked, and if it isnt, the tick it. If your this doest work, then untick it and click apply, then re- tick it, and go apply again. If this STILL doent work, then cross off the windows, and right click the desktop, go "desktop", and choose another background.
Hope that this solves your drop shadows problem!
06castwo
Open Desktop Background by clicking the Start button 
and clicking Control Panel. In the search box, type desktop background, and then click Change desktop background.
Click the picture or color that you want to use for your desktop background.
If the picture you want to use isn't in the list of desktop background pictures, click an item in the Picture location list to see other categories, or click Browse to search for the picture on your computer. When you find the picture that you want, double-click it. It will become your desktop background.
Look for pictures in other locations on your computer
Under Picture position, click the arrow and choose whether to crop the picture to fill the screen, fit the picture to the screen, stretch the picture to fit the screen, tile the picture, or center the picture on the screen, and then click Save changes.
Note
If you choose to have a fitted or centered picture as your desktop background, you can also frame your picture with a color background. Under Picture position, click Fit or Center. Click Change background color, click a color, and then click OK.
Tip
To make any picture stored on your computer (or a picture you are currently viewing) your desktop background, right-click the picture, and then click Set as Desktop Background.
The Set as Desktop Background option
You can add more desktop backgrounds to your collection from the Personalization Gallery on the Windows website.
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