Using Word 97

With Numbers Lock OFF the numbers pad on the keyboard works normally.

With Numbers Lock ON, no numbers. But using the keys has the effect of moving the I beam cursor around the screen in the direction of the arrows on the 2 4 6 and 8 keys, and diagonally up or down if using the 1 3 7 0r 9 keys.
The flashing insertion point cursor does not move at all