Well, the first step is the most simple one. As Schatzi said, check to make sure your Num Lock key is on. If its not, the keypad wont work.
Beyond that, have you looked at your Aces High keymap to make sure the views are mapped? If not, start Aces High, log in, and click Options on the clipboard. Click on Controls, and then Keymap. Find the Views and click on it, and see what keys are mapped to those views. If they are not mapped, there should be a button to set the keys to default.