I've played quite a few games and the num pad worked fine for movement, but when I fired a new game up this morning no response from it. Of course, I tried the numlock button and did a reinstall with no success. Using the arrow keys and pg up pg dn keys as substitutes works ok, but I'd rather use the num pad. Any ideas?

Problem solved by unplugging the keyboard from my desktop and putting it back in. Doh.