1. Open Regedit.
2. (OPTIONAL) If you want to make the change on a remote computer, navigate to "File > Connect Network Registry." Enter the GB number and hit "Enter."
3. Navigate to HKEY_USERS\.Default\Control Panel\Keyboard
4. Change the value for InitialKeyboardIndicators from 0 to 2.

5. Hit Ctrl-F and look for all entries of 'InitialKeyboardIndicators' - there should be five. Change their values to 2.

6. Have the user log off or restart and you should see the NumLock enabled by default.