@Enthousiast 1. Yesterday's SiMPLiXed ISO with removed ei.cfg is now installing on VBox... 2. When it comes time for me to test your amended W7_x64_Single_ESU_Index_Only_New_2.3_WIN7_Based_ISO_BETA_Development Script is it OK to filter out some (to my mind) unnecessary USB3x_7_x64 drivers from the folder? Currently the script is installing 23 driver packages. My machine is intel based so I don't really need to have Amd or Etron for example. VBox installation has now completed and reached the desktop successfully. I look forward to testing the latest script.