Windows Registry Recovery When Your Computer Won’t Boot

Windows can't boot and get following error message 
  • Windows XP could not start because the following file is missing or corrupt: \WINDOWS\SYSTEM32\CONFIG\SYSTEM
  • Windows XP could not start because the following file is missing or corrupt: \WINDOWS\SYSTEM32\CONFIG\SOFTWARE
  • Stop: c0000218 {Registry File Failure} The registry cannot load the hive (file): \SystemRoot\System32\Config\SOFTWARE or its log or alternate 
  • System error: Lsass.exe
    • When trying to update a password the return status indicates that the value provided as the current password is not correct.

You can following method to restore windows registry
Windows 7/Windows XP
Method 1:
Boot to command prompt or Windows PE
Rename following file:
ren c:\windows\system32\config\system c:\windows\tmp\system.bakren c:\windows\system32\config\software c:\windows\tmp\software.bakren c:\windows\system32\config\sam c:\windows\tmp\sam.bakren c:\windows\system32\config\security c:\windows\tmp\security.bakren c:\windows\system32\config\default c:\windows\tmp\default.bak
Restore following file:
copy c:\windows\repair\system c:\windows\system32\config\systemcopy c:\windows\repair\software c:\windows\system32\config\softwarecopy c:\windows\repair\sam c:\windows\system32\config\samcopy c:\windows\repair\security c:\windows\system32\config\securitycopy c:\windows\repair\default c:\windows\system32\config\default
 Reboot

Method 2:
Windows XP
Boot to command promptUsing following command to restore or bakcup registry:
scanreg /restore
scanreg /backup

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