How to fix windows7 system registry damage failure

The system registry is damaged, the repair fails with the U disk, and the corresponding dll file can not be found by the registry repair tool. In fact, we can replace the existing solution with the system backup registry file. The solution is as follows:
1, first use the win7 system U disk or CD boot, then open the cmd window, enter the following command in the open command prompt window and then enter;
C:windowssystem32configRegBack
2, then use the copy command Copy all the files in the directory to the C:windowssystem32config directory. The command is as follows:
copy C:windowssystem32configRegBack* C:windowssystem32config
3, after restarting the computer, you can repair the registry corruption.