Hello. Thanks for taking the time to reply with a detailed answer. There are some nice new tools for me to check out there and some things I can try. I will ready through those forums that you posted too, they look quite interesting. I have been looking at adding Winxp.wim into winpe_x86.iso and have this install the wim, I may use that method but i'm trying to figure out the below mystery. I recently come across a download of an auto-install xp sp3+raid drivers+all windows updates+flash that came as a windows xp iso. Which had the same file structure as the original xp disk. It didn't look like any 3rd party software was used to create it. Someone has set up a fully updated auto-install Windows XP SP3. I'm not sure exactly how this was created. But having tested this i'm very curious on how this was put together. I haven't see any traces of nLite and the above is downloaded as an ISO. So I'm guessing the creator installed this on a VM / Physical machine and then managed to Windows update it, add flash and sysprep and somehow turn it back into an ISO. (although i'm just guessing) I would really like to learn the secrets of how it was made and mimic it in my auto install. i'm after adding some additional apps to it too citrix receiver, adobe reader, flash, java, silverlight, .net framework. I don't know if this is even possible with out some 3rd party imaging software.