Yes, NEVER edit a bootable .iso. If you are into experimenting, you can try the pesort approach and you can probably shave a few (several) seconds at boot time: http://www.911cd.net/forums//index.php?showtopic=6869 OT I don't recall anyone publishing or testing a list for "normal" install, but maybe the same increase of speed can be achieved. jaclaz But now i've updated the grldr/multiboot iso with acronis true image 2010 iso using ultraiso & then it boots correctly See The "iso-level-4" option made this stuff i think and once again thanks to cdob for solving the 8character limit and thank you jaclaz for warning me in editing the iso i appreciate your seniority aswell.