The system cannot enter because the registry is modified, and the security mode does not.

One day, I deleted the Sam and security items under the Registry. After restarting, the system could not enter the desktop, and the security mode could not,

So the system House tried the following solutions:

1. Use the Windows 7 system USB flash drive to fix the problem. 2. Use the Registry Repair Tool and prompt that the corresponding DLL file cannot be found. 3. Use the system to restore the file, however, after a System Restore point is not established, the existing registry file backed up by the system is replaced. The specific method is to start it with a win7pe system USB flash drive. after entering the system, put the c: \ windows \ system32 \ config \ regback directory under the original system, copy all files in the directory to the c: \ windows \ system32 \ config directory, and restart the computer.

The system cannot enter because the registry is modified, and the security mode does not.