If this is an Unattended Install, I believe (not sure) that it's always going to be relative to the ROOT folder (c:/yada-ROOT-withOsTags/otherFoldersAndFiles). If that's the case, best to create an ISO Image of everything in the ROOT folder and up (but not the root-folder itself, only the CONTENTS). I don't think (again, unsure) that an Unattended will work in the fashion you're trying (IF an Unattended, which it definitely sounds like).
note - someone else more knowledgeable may be able to expand/correct this post information.
This post has been edited by submix8c: 15 April 2010 - 08:35 AM