I have a client whose Windows 7 Home Premium installation went belly up. She's bought a new PC, and we cannot locate the OEM product key for her installation. We can find the cardboard sleeve that holds the product key plastic card that has the key on it, but not the plastic card.
Retrieving the product key from a working Windows system is easy. Is there any way to get the product key if I plug her HD into my own system temporarily as a second drive?