Windows update data base error detected 0x80070490

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what should I do windows update data base error detected 0x80070490?my windows store background also become dark &amp blur..

 

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Original title: Please Help me..

Windows Store question also asked here:

http://answers.microsoft.com/en-us/windows/forum/windows_8-windows_store/windows-8-store-background-dark/6cae423c-1bac-4eda-bd77-84ba7cf86b0b

 

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