When you use Ctrl+Shift+F3 to enter audit mode. After you boot to the desktop, close the sysprep box. Then from start -> run you type: c:\windows\system32\sysprep\sysprep.exe /oobe /reboot /unattend:path_to_unattend.xml. You probably should make sure your XML is validated, or else you may have to reinstall again if Setup/Sysprep doesn't like the file, or if it isn't built properly.