Lo primero Kasswed siento que todas las soluciones que di a ése problema hace tiempo te parezcan poco prácticas.
Lo segundo, leyendo en la web de Microsoft, he visto otra forma de solucionar el problema de la velocidad en los juegos.
Fix Older Games that Run Too Fast
Sometimes, you'll finally get a game to work only to have it run too fast to be playable. The sounds will be scrambled, animation will be ridiculously fast, and you'll simply be unable to keep up with the game. If that happens, you need a slowdown tool like the awesome Cpukiller. Cpukiller 3 is a shareware program that runs in the background and eats up CPU cycles. This limits CPU power and effectively slows it down. You can turn it on and off at your discretion, so it only needs to work when you're running those legacy games.
Succeeding at getting your ancient games up and running on Windows XP can be as rewarding as playing the game itself! At the very least, it's a good way to spend a rainy afternoon.
Fuente:
http://www.microsoft.com/windowsxp/using/games/expert/durham_og.mspxEl referenciado Cpukiller te lo puedes bajar desde
http://www.cpukiller.com/cpukil30.zipUn saludo y que haya suerte.