Windows contains registry settings that control the state of the Num Lock, Caps Lock, and Scroll Lock keys at boot. You'll have to change these registry settings to have Windows 10 automatically enable Num Lock at boot.

To set Numlock to be on every time you start the computer, double click InitialKeyboardIndicators, change the value data to 2, and click OK. Repeat this process for the other user entries in your registry (unfortunately, you'll have to do it manually for each one).

In order to be able to use the NumPad to type the system password, you need to enable Windows 10 NumLock on startup. Simply turning it on from the lock screen, using the windows settings will get rid of the problem. Changing some of the Windows registry file values will turn all of the Num keys on.

1) When on the lock screen, press the Num lock key on your keyboard. 2) Reboot your PC from the virtual power button on the lock screen. 3) This should now auto enable the NumLock on the next restart.