Okay I think I may have solved the problem. Unfortunately, it means I have to reprogram most of the game
Basically, I have to make the game check your Operating System version (Windows 2000, XP, Vista, etc..). And then modify all its settings based on the operating system. This also means registration files have to be altered depending on people's operating systems.

So basically, I can continue developing the game on my current PC but I have to reprogram most of the game. I'm not going to start just yet because I want to wait for the Hardware Acceleration Beta to updated a bit more (there's currently problems with it rendering text & large windows). Once the next update is released (and depending on what's fixed), I'll start reprogramming the game. Til then, signup to the forums and get involved