How do I enable the NUM LOCK key for the logon screen?

The status of the NUM LOCK key is specific for each user, and NUM LOCK is disabled by default. If you want the NUM LOCK key enabled for use before a user presses CTRL+ALT+DEL to log on, you must use Registry Editor to change the default behavior.

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Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
To enable NUM LOCK before a user logs on, follow these steps:

1. Run Registry Editor.
2. Move to HKEY_USERS\.Default\Control Panel\Keyboard.
3. Change the value for InitialKeyboardIndicators from 0 to 2.