1. Make http://www.google.com of the WINDOWSXP installation disk to start in the optical drive, press R to enter the 'failure recovery console', enter 're' in the command line


pair 'folder, copy the five files of default, sam, security, application, system to C


: \\ Windows \\ system32 \\ config, just restart the computer.


2. http://www.diskgetor.com/recover-data-from-formatted-hard-drive.htm enters the security mode in the major of your choice, enter the Administrator super user login, and then get started the menu-


-Programs --- Accessories --- System Tools --- Method Restore.


3. It cannot be repaired by CD, there is no system backup, and you can't enter the protected mode, then straight redo the technique.