Hi,
I assume you are using the Vista disk that came in with the system. Even though you can see a product key on your friends computer, It would not work on your own computer because that product key is intended only for that DELL computer. The windows Vista that your friend has is an OEM copy of the operating system. The product key should match the Hardware of the OEM computer for it to work.
I suggest you get a genuine copy of the operating system for your self.
Hope this helps.
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