Microsoft Windows HPC Server 2008 Installation Guide

Click OK.
c. After the image is added, select the appropriate OS image. If you are using an OEM
image with new HP hardware, you do not need to enter a key. The key is automatically
encoded into the image. If you are using older hardware, or are using a non-OEM image,
you can enter your OS key.
4.3 Installing HPCS from CD 41