Hi, I am Dave, I will help you with this.
1
If you press the Num Lock key or Fn + the Num Lock key does that get the number pad working?
2
If that does not get the number pad working:
Open the old Control Panel
At the top of the old Control Panel, set View to large icons
Open the Ease of Access Center.
Select 'Make the keyboard easier to use'
Turn off all options in Mouse Keys, Sticky Keys, Filter Keys and Toggle keys.
Save those settings and restart (not shut down) your PC to apply the change.