I bought a used DVD drive from a thrift store which contained an Office 2000 Premium CD. I do not have a product key code and Office 2000 is no longer supported so a key code is not available. I can install the software without the code but when I try to use it, the program runs and a popup screen asks me for the code. How do I obtain a key code for a product that is no longer supported? Can a program like magicaljellybean.com/keyfinder locate the code if it was never entered during the installation?