Everything seems to slipstream ok but now I get an error before windows starts for the first time: If I hit open I get a blank Internet Exploder page and then nothing continues. If I hit cancel, the same thing.. setup just hangs and does not continue to the next step (create user account, auto update, firewall, register questions, etc) If I do a restart at this point then setup will continue, and runs through my RunOnceEx.cmd additions ok. The system I am left with has a broken IE that cannot connect to the internet and does not even let me go into the settings from the menu! I have a theory that a particular update has done this, so will do ( yet another ) rebuild of the cd until I track it down.... UPDATE: Just as I thought, it was the WindowsXP-KB912945-x86-ENU.exe update causing the problem! Has anyone else had a problem with this update? WindowsXP-KB905915-x86-ENU.exe is still giving me a problem too, I no longer get an error during install but update is not applied.