While trying to image Windows 7 Enterprise Edition systems, you receive one of the following errors if you use the option to "Prepare with Sysprep".
In this case a MAK license was used with Windows 7 Enterprise. This form of licensing is not supported by Microsoft for Windows 7 Enterprise.
Microsoft now requires imaging Windows 7 with Sysprep. To see a step by step guide on how to image Windows 7:
If using the Microsoft sysprep utility while imaging Windows 7 Enterprise Edition, do not use a MAK license key. Choose Windows 7 Enterprise as your OS but then leave the key value set to "Use Existing Key".
Windows 7 Enterprise Edition