1. Use the WINDOWSXP installation disk to start from the optical drive, press R to enter the 'failure recovery console', enter 're' in the command line


pair 'folder, copy the 5 files of default, sam, safety, computer software, system to C


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


2. full version enters the safety mode in the prime on the choice, enter the Administrator super user login, after which start the menu-


-Programs --- Accessories --- Program Tools --- Method Restore.


three. It cannot be repaired by CD, there 's no system backup, and also you cannot enter the protected mode, then directly redo the system.