Fixing Windows errors, tweaking Windows features, or completely removing a program can sometimes require you to edit the Windows registry. This page provides help on how to open and view the Windows registry, as well as edit and delete registry values.

• Error Creating Registry Key Hkey_local_machine
• What Is Hklm
• Hkey Local Machine Location
• C# Read Registry Key Hkey_local_machine Returns Null

Caution

This isolates HKEYCLASSESROOT, because the per-computer portion of this tree resides within the following registry key: HKEYLOCALMACHINESoftware To enable 64-bit/32-bit program interoperability through COM and other mechanisms, WOW64 uses a 'Registry Reflector' that mirrors certain registry keys and values between the 64-bit and 32-bit. DisableWindowsUpdateAccess RegDWORD 1 = Disables access to Windows Update. 0 = Enables access to Windows Update WUServer RegSZ HTTP(S) URL of the WSUS server that is used by Automatic Updates and API callers (by default). This policy is paired with WUStatusServer, and both keys must be set to the. When I uninstalled 'Microsoft Office 2013' on 'Windows 2012 R2 Server' OS and tried installing my plugin, It still installs because it finds a registry key 'HKEYLOCALMACHINE SOFTWARE Microsoft Office 15.0 Word Text Converters' which has not got deleted during uninstallation of MS Office 2013. The HKEYLOCALMACHINE, or HKLM, is part of the Windows registry, which is a database containing all computer and user information. In particular, the HKLM registry hive contains the computer settings and properties. Other registry hives such as HKEYCURRENTUSER or HKEYUSERS contain user properties and settings. Several sub-keys exist under HKLM. How to browse the Windows registry. When most users need to edit their registry, they're given the location or path of where the registry value is located and what to change. Below is an example path for a commonly accessed registry subkey. To browse to this location, you first start by opening the HKEYLOCALMACHINE key (folder). Exactly, running this snippet above in VS or by going to /bin/Debug/App.exe and running that as Admin resulted in the below error: An unhandled exception of type 'System.UnauthorizedAccessException' occurred in mscorlib.dll Additional information: Access to the registry key 'HKEYLOCALMACHINE SOFTWARE YourCompanyName SomeNewKey' is denied. HKEYLOCALMACHINE, often abbreviated as HKLM, is one of several registry hives that make up the Windows Registry. This particular hive contains the majority of the configuration information for the software you have installed, as well as for the Windows operating system itself.

Before editing or changing anything in the Microsoft Windows registry, it's recommended that you backup the registry. We also highly recommend that anyone new to the registry become familiar with all the Windows registry basics.

How to open the Windows registry

Error Creating Registry Key Hkey_local_machine

To open the Windows registry, follow the steps below for your version of Windows.

Note

If you have restricted access to the Windows computer you're logged into, you may not be able to access the Windows registry.

Windows 10

1. Type regedit in the Windows search box on the taskbar and press Enter.
2. If prompted by User Account Control, click Yes to open the Registry Editor.
3. The Windows Registry Editor window should open and look similar to the example shown below.

Windows 8

1. Type regedit on the Start screen and select the regedit option in the search results.
2. If prompted by User Account Control, click Yes to open the Registry Editor.
3. The Windows Registry Editor window should open and look similar to the example shown below.

Windows 7 and earlier

1. Click Start or press the Windows key.
2. In the Start menu, either in the Run box or the Search box, type regedit and press Enter. In Windows 8, you can type regedit on the Start screen and select the regedit option in the search results. In Windows 10, type regedit in the Search box on the taskbar and press Enter.
3. If prompted by User Account Control, click Yes to open the Registry Editor.
4. The Windows Registry Editor window should open and look similar to the example shown below.

How to browse the Windows registry

When most users need to edit their registry, they're given the location or path of where the registry value is located and what to change. Below is an example path for a commonly accessed registry subkey. To browse to this location, you first start by opening the HKEY_LOCAL_MACHINE key (folder). In this key, you will see the SOFTWARE folder, then Microsoft, Windows, CurrentVersion, and finally the Run folder.

HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionRun

Tip

Each backslash (') in a registry path represents another folder in the registry, with the name of that folder following the backslash.

After navigating to the above registry path, you'll see a window similar to the example below. In this example, you can see four different string value keys, which in this case are pointing to each of the programs Windows runs each time the computer is turned on or restarted.

How to edit a Windows registry value

To edit a registry value, double-click the name of the value you want to edit. For example, if we were to double-click the 'IntelliPoint' value in the example above, a new window would appear that would allow us to change the value of the Data. In this case, we could change the file path of where the 'ipoint.exe' file is located for the IntelliPoint driver.

How to delete a Windows registry value

To delete a registry value, highlight any registry Name and then press the Delete key on the keyboard. For example, if we did not want the IntelliPoint program to load each time Windows starts, we could highlight IntelliPoint and then press the delete key.

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Windows registry shorthand and abbreviations

In some documentation and online forums, the registry values may be abbreviated. For example, instead of saying 'HKEY_LOCAL_MACHINE,' it is easier to say and write 'HKLM.' For a listing of registry terms and shorthand, see our registry definition. Sailor moon fighting game.

Additional information

• See our registry definition for further information and related links.

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Run and RunOnce registry keys cause programs to run each time that a user logs on. The data value for a key is a command line no longer than 260 characters. Register programs to run by adding entries of the form description-string=commandline. You can write multiple entries under a key. If more than one program is registered under any particular key, the order in which those programs run is indeterminate.

The Windows registry includes the following four keys:

• HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionRun
• HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionRun
• HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionRunOnce
• HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionRunOnce

By default, the value of a RunOnce key is deleted before the command line is run. You can prefix a RunOnce value name with an exclamation point (!) to defer deletion of the value until after the command runs. Without the exclamation point prefix, if the RunOnce operation fails the associated program will not be asked to run the next time you start the computer.

What Is Hklm

By default, these keys are ignored when the computer is started in Safe Mode. The value name of RunOnce keys can be prefixed with an asterisk (*) to force the program to run even in Safe mode.

Hkey Local Machine Location

A program run from any of these keys should not write to the key during its execution because this will interfere with the execution of other programs registered under the key. Applications should use the RunOnce or RunOnceServices keys only for transient conditions, such as to complete application setup. An application must not continually recreate entries under RunOnce or RunOnceServices because this will interfere with Windows Setup.

C# Read Registry Key Hkey_local_machine Returns Null

Run and RunOnce keys are run each time a new user logs in. RunServices and RunServicesOnce are run in the background when the logon dialog box first appears or at this stage of the boot process if there is no logon. These keys are for background services such as remote registry service and are run only once per boot. The Setup key is run only by Setup's first-boot activities, or after you use the Add/Remove Programs Wizard. This key displays the progress dialog box as the keys are run one at a time. For the Setup key, the name of the value is the name that is displayed in the dialog box.