I've been using Alpha Four Ver. 6.03 for several years and suddenly lost my zero key on the number keypad of the keyboard. Thinking it was a hardware issue, I ran to dell and they replaced the keyboard. When I tried using again, I have the same problem: several keystrokes on the zero key and maybe 1 zero appears if lucky. The zero key above the alpha keys works well.

I confirmed that it is a software problem because the number keypad works well in all other programs. I would appreciate any insight on this problem.