Black desktop after logging in

I am running windows 7 basic on an acer netbook and everytime I log on i get a desktop that is covered in black except for the application shortcut icons. Wehn i highlight areas of the desktop by draging the mouse over it it gets rid of the black. Its pretty annoying has anyone else had this problem? Also ive noticed as I type this my text is is being entered way after I type it in like one letter at a time very slowly.

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(NT) Do other accounts work?
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Are you using any UI editing software?

Like Windows Blinds or Desktop X? Also please check that your version of Windows is activated correctly by going into CMD.exe and typing slmgr -dlv and chekcing if it's activated an SKU or not...

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