Windows 7 deployment not supported with Configuration Manager
I have seen a few questions about support for ZTI support for Windows 7. It’s currently not supported. You can deploy Windows 7 using LTI MDT 2010 beta or MDT 2008. MDT 2008 requies a few modifications in order to support Windows 7 deployment.

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Not supported or not working ?
Not working due to the way images are handled