script for entering Product Key


I Need to deploy a number of computers.
For that I have made a clean Windows7 installation and prepared/installed all the software on it.
But I have not entered the product key or activeted Windows. Now I made a clone of the HDD and I'm going to deploy it.

Is there a a way to make a script or something so I dont have to click alt the way into control panel - system - activate and then enter the product key and activate it? On all 25 computers, and later on - another 50 computers.

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