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-3V4VD
HomePremium - X9HTF-MKJQQ-XK376-TJ7T4-76PKF
Ultimate - VMCB9-FDRV6-6CDQM-RV23K-RP8F7
Save the file as AutoUnattend.xml to the root of a USB key.