REG RESTORE KeyName FileName KeyName ROOTKEY\SubKey (local machine only) ROOTKEY HKLM | HKCU | HKCR | HKU | HKCC SubKey The ...

REG RESTORE KeyName FileName

  KeyName    ROOTKEY\SubKey (local machine only)
    ROOTKEY  [ HKLM | HKCU | HKCR | HKU | HKCC ]
    SubKey   The full name of a registry key to restore the hive file into.
             Overwrites the existing key's values and subkeys.

  FileName   The name of the hive file to restore.
             You must use REG SAVE to create this file.

Examples:

  REG RESTORE HKLM\Software\Microsoft
esKit NTRKBkUp.hiv
    Restores the file NTRKBkUp.hiv overwriting the key ResKit