Group policies messing with your Windows 7 deployment
There a number of group policies that can interfere when you are deploying Windows 7 machines, one of them being the “Admin approval mode for the built-in local administrator account” which if set to enabled breaks deployment using the Lite Touch scenario using Microsoft Deployment Toolkit.
My fellow MVP and now also colleague Johan Arwidmark has a blog post on two methods for handling problems related to group policies when dpeloying machines, either by settings filters on your group policies or postponing the domain join process.