You have two Autounattend.xml files (answer files) that can be used in an unattended installation of Windows Vista. One Autounattend.xml file is in the root directory of the Windows Vista installation disc. The other Autounattend.xml file is in the root directory of a USB flash drive. When you perform an unattended installation of Windows Vista, the installation uses the Autounattend.xml file on the Windows Vista installation disc instead of the Autounattend.xml file on the flash drive. You expect the installation to use the file on the flash drive according to the implicit order of the search paths.