Posted 28 December 2012 - 11:52 PM
Thanks for your reply. My problem is solved. It is still a mystery why I got into that situation. It seems nothing to do with the bootmanager, since it was still in some environment.
I could type in my password and enter my account, but I only got a black screen with a cmd window. I used command bcdedit in cmd window to list the boot manager settings, it seems OK.
The way to get out is use Ctrl-Alt-Delete key to invoke the task manager, and initiate a new explorer task, this brings back the familiar desktop environment, then I managed to get a
system refreshed and returned to its original status. My Vaio Duo 11 is back to live.
By the way, to refresh the system (a facility provided by Windows 8 system tool), the directory C:/Windows is created, and the old one is saved in C:/Windows.old. It is difficult to remove
the C:/Windows.old since there are may files in some directories have extremely long file names! In order to remove the Windows.old directory, I installed Cygwin and used Cygwin's rm
command to remove the directory.