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.
You have to modify the registry to enable. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully.
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.
For more technical assistence go through operating system support services
