Hello everybody I' m french I have a problem on my Windows 7 computer's . I have installed SDK for Windows 7 , superfetch is running on automatic mode . And I have writed The command line : xbootmgr -trace boot -prepSystem -verboseReadyBoot The optimisation started, the first step worked and The computer restarted. But when the second step started my computer block on "preparing system" and I can't move my mouse. I have waited during 1 hour and restarted the computer . But always when The second step begin The computer bug. Why ? How can I resolve it ? Thanks a lot .