My friend Chris Nackers have a great post on an old nasty issue, the basic issue is that when you deploy Win 7 machines it will end with this:
Here is the solution:
http://myitforum.com/cs2/blogs/cnackers/archive/2011/05/11/incorporating-kb2028749-into-your-microsoft-deployment-toolkit-reference-image-build-process.aspx
/mike
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Categories: Deployment
The Deployment Bunny 
Cool! But that hotfix is included in the Windows 7 SP1 image. :)
// Fredrik “DXter” Jonsson
Yes, that is correct, but some customers will not run SP1 for the moment. Yes, I know that sounds strange, but that is fact.