Set the status of NUM LOCK key enabled automatically

1. Click Start button then type regedit in Run option then press Enter for next.
 
Here locate the location to:

2. HKEY_USERS\.Default\Control Panel\Keyboard
3. Here in right side panel, double click on the value InitialKeyboardIndicators then change its value data from 0 to 2.
4. Now close the registry editor and restart your computer after any changes to go into effect.