KB Article: http://support.microsoft.com/kb/2383895
When you open a list (.cil) in Volume Activation Management Tool (VAMT) 2.0 on a Windows 7-based computer, you may receive the following error message:
An item with the same key has already been added.
i am using windows disc to boot my pc cause window 7 64 bit does not see a plug and play high speed 10 port usb 2.0 hub. made by vantec