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
