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This program get's its information from the registry. How do you know you got a wrong key? Most pre-loaded systems, like from Gateway, Dell, IBM and so forth, load the system from the factory from an image pre-created. I have a mixture of Dells, both Home and Pro editions that are all using the same CDKEY because of preloading. If you have one of these OEM computers, the sticker on your system is the one to use when reloading, if you need to. That number hasn't been activated with Microsoft.