Keyboard events

Question

Hello all!! I'm currently developing a windows application which supports a very old keyboard (about 25 years old). In order to make it work, I have to redefine some of the functional keys values from that old keyboard to a unique value. I'm using the Windows API function  keybd_event. Everything works fine until the application crashes. It will then completely redefine all of the keys, including my Windows keyboard. For example, my letter 'A" becomes a tab. Any advice is greatly appreciate it!!!

Thanks,
Petetr