Disable Legal Notice during Windows 7 Deployment

Solution:
Open the unattend.xml file using a Text Editor and add the following Synchronous Command to the unattend.xml File in the corresponding Task Sequence Folder (\\%DistributionServer%\DistributionShare\Control\%TSId%\unattend.xml)

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Disable Legal Notice
3
cmd /c reg add "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\GPExtensions\{827D319E-6EAC-11D2-A4EA-00C04F79F83A}" /v NoMachinePolicy /t REG_DWORD /d 1 /f

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There are also steps for when using MDT for Deployment in the URL attached.

Source:
http://www.microtom.net/?p=675