I'm trying to make a single (Auto)Unattend.xml file to install Windows 8.1 Pro with Update on several HP computers with the same model #. Each one has an embedded (MSDM) key for Windows 8 Pro in it. When I tried installation with a (said) generic key for Win8.1Pro preplaced in the key field in the unattend file, the generic key wouldn't be replaced with the embedded key automatically upon completion of installation. With nothing (blank) in the key field, I was asked which version (Pro or non-pro) I wanted to install and for a key for it in addition. I know it will work if I place each embedded one for each computer. I need to make a single unattend file for all my HP's though... Thanks in advance for any idea.