Ok, thanks Andre! Now, I was looking at the xbootmgr log on the users file. Just for me to understand it better, what exactly does it do? It defragments disk before prefetcher? How does readyboot knows the drivers and applications files that are "prefetched" and is there any way to edit them? I noticed that are .cab, .db files...besides a "layout.ini" file. Can you please explain more details about the process? Thanks again