Incorporating KB2028749 Into Your Microsoft Deployment Toolkit Reference Image Build Process
http://support.microsoft.com/kb/2028749
A “Set Network Location” dialog box appears when you first log on to a domain-joined Windows 7-based client computer

First download the KB from the above link. Once you have the files extracted out, we will need to import those updates into the Deployment Workbench.
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Open up your deployment share, and then expand to the packages node. Right-click and select “Import OS Packages”.
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Point the package source directory to the location containing the 2 hotfixes.
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Once you have imported the updates. Create a new folder called “Windows 7”.
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Move the updates into the Windows 7 folder.
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Expand Advanced Configuration, then right click on Selection Profiles and select “New Selection Profile”.
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Create a Selection Profile called “Windows 7 Hotfixes”.
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Select the Windows 7 folder that we previously created.
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Next we need to open our Windows 7 Task Sequence and expand “Preinstall”. Click on the “Apply Patches” step.
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We need to change our selection profile to match the new “Windows 7 Hotfixes” Selection Profile that we created.
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Now you can rebuild your reference image to include KB2028749 and eliminated the “Set Network Location” prompt.
Hope that helps.