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What do you know about HKEY_LOCAL_MACHINE (HKLM)?



What is it?

HKEY stands for "Handle to Registry Key”.

The HKEY_LOCAL_MACHINE subtree contains information about the local computer system, including hardware and operating system data, such as bus type, system memory, device drivers, and startup control parameters.

It is one of several registry hives in the Windows Registry. HKEY_LOCAL_MACHINE contains the majority of the configuration information for the software you have installed and for the Windows operating system itself.

It also contains information about currently detected hardware and, beginning in Windows Vista, information about your computer's boot configuration.

HKLM components

The following registry keys are located under the HKEY_LOCAL_MACHINE hive:
  • HKEY_LOCAL_MACHINE\BCD00000000
  • HKEY_LOCAL_MACHINE\COMPONENTS
  • HKEY_LOCAL_MACHINE\HARDWARE
  • HKEY_LOCAL_MACHINE\SAM
  • HKEY_LOCAL_MACHINE\Schema
  • HKEY_LOCAL_MACHINE\SECURITY
  • HKEY_LOCAL_MACHINE\SOFTWARE
  • HKEY_LOCAL_MACHINE\SYSTEM
Note: The keys located under HKEY_LOCAL_MACHINE on your computer may differ somewhat depending on your version of Windows and your specific computer configuration.

Is it differing from HKCU?

The HKEY_LOCAL_MACHINE hive is global, meaning that it's the same no matter which user on the computer views it, unlike HKEY_CURRENT_USER which is user specific that contains configuration information for Windows and software specific to the currently logged in user.

The registry key that is located under HKCU control user-level settings like the printers installed, desktop wallpaper, display settings, keyboard layout, mapped network drives, and more.

How  can  you find it?

HKEY_LOCAL_MACHINE does not actually exist anywhere on the computer, but is instead just a container for displaying the actual registry data being loaded via the subkeys located within the hive, listed above. Because of this, you, nor any program you install, can create additional keys under HKEY_LOCAL_MACHINE.

HKEY_LOCAL_MACHINE can be accessed by opening Registry Editor and then clicking on the HKEY_LOCAL_MACHINE "folder" on the left side of the program window.
Open HKEY_LOCAL_MACHINE:
Go to run > regedit > yes

Note: if you can’t open Regedit go to run and type "gpedit.msc” clicks on administrative template>double click on system>double click Prevent access to registry editing tools>click not configure or disable. Then apply then click ok








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