I use GuiAttended because I read, that OOBE does not work for Full Unattended. ProgramFilesDir is part of the textmode-setup, for this GuiAttended is the same as FullUnattended. The difference between the versions is: SP2+ post-SP2- hotfixes / SP3 + post-SP3-hotfixes. Unfortunately I kill all the LastSession.inis with SP2 after starting with SP3-integration. All Dual/Quad Core and Pentium HT processors are ACPI-Multiprocessor-PCs. As I told before,I will nlite an XP with SP3 and Winnt.sif only and test this tomorrow.