The uncrackable game?

[Yano261]

I have tryed to get help with this game before, but no luck.
The game is jane's USAF. I copyed it and installed it on my computer, who runs with Windows XP pro. I always get the question to put in the original CD, that I no longer have. I have tryed to crack it with all the cracks I can find on megagames.com. I have also tryed the patch 1.02f, without any help. Is there anyone who had any of the same problem that can help me?