Disable Num Lock

This registry edit controls whether Numlock is enabled or disabled when you login to Windows.

1. Launch Registry Editor
   (Start > Search: regedit > press [Enter])
2. Go to the registry key:

   HKEY_USERS\.Default\Control Panel\Keyboard

3. Change the value of InitialKeyboardIndicators:
   Set it to 0 to set NumLock to OFF
   Set it to 2 to set NumLock to ON

References

Enable/Disable Numlock at Login or Startup
http://www.technipages.com/enabledisable-numlock-at-login-or-startup.html