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.
This problem may occur if there are multiple network adapters in the computer, and these networks adapters have the same MAC address. For example this problem may occur if you have two network adapters for a virtual machine, and you configure these network adapters to have the same MAC address.
If you open the .cil file in this situation, you see an entry that resembles the following:
To have us delete the duplicate entries from the .CIL file for you, go to the "Fix it for me" section. If you prefer to delete the duplicate entries from the .CIL file yourself, go to the "Let me fix it myself" section.
Fix it for me
To fix this problem automatically, click the Fix it button or link. Then click Run in the File Download dialog box, and follow the steps in the Fix it wizard.
Please select a .CIL file which you want to delete the duplicate entries for.
The Fix it solution does not work if the VAMT(Volume Activation Management Tool) 2.0 is not installed in the default path.
This wizard may be in English only. However, the automatic fix also works for other language versions of Windows.
If you are not on the computer that has the problem, save the Fix it solution to a flash drive or a CD and then run it on the computer that has the problem.