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I had installed Oracle VM VirtualBox version 4.2.10 r84104 on Windows 7.Then I create a Windows seven operating system(form an iso image file) as a guest on it with a shred folder.But when I try to start guest,I see this warning:

enter image description here

So I reinstalled VirtualBox,but problem remains yet.How I can solve this problem?May be it correspond to this version of VirtualBox?

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Did you create the folder first and then add it in VBox? –  BJ292 Jun 19 '13 at 19:50
    
@BJ292 Yes.I first create folder and then add it. –  hasanghaforian Jun 19 '13 at 19:52
    
I don't see why it would make a difference but you might want to upgrade to the latest version. –  BJ292 Jun 19 '13 at 19:57
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