Copy the following text to notepad. For the product key, enter the product key that corresponds to the version of Windows Vista you want to install. Vista Default Product Keys: Business - 4D2XH-PRBMM-8Q22B-K8BM3-MRW4W HomeBasic - RCG7P-TX42D-HM8FM-TCFCW
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Read the complete post at http://blogs.technet.com/backroom/archive/2007/02/08/automate-your-vista-factory-installations.aspx