Well you're first problem is that you don't have the full game, you have a warez rip that's burnt on a cd.
You might wanna try extracting the whole thing to your HD and then running the reg file from there and give it a shot. Many of the warez rips wont work with all systems. If you can, it's better if you just get yourself the ISO or the full game (it's not that expensive anymore, runs you about 20 bucks in the US).
Also, make sure you got the latest drivers for your sound card and video card, as well as the latest release of direct X from M$.