Numberpad Problem

I have read all the suggestions, tried them all, and I still can't resolve the problem. I use an IBM plug-in keyboard with my IBM/LenovoZ60m laptop.

The keypad has a numlock key. The laptop keyboard requires Fn-Numlock.

No matter what combinations I try, including the on-screen keyboard, I get either numbers on both the plug-in keyboard and on the main keyboard's iop and jkl keys, or I get normal letters on the main keyboard and directional keys (1-end, 2-down, 3-PgDn, 4-left, 5-nothing, 6-right, 7-home, eight-up and 9-PgUp) on the plug-in.

Any other suggestions most appreciated.