Follow these steps:
1. If you haven't already, create a virtual disc image of the game. You can use the free program ImgBurn to complete this step. ImgBurn website:
http://www.imgburn.com/
2. You then need to mount the virtual disc image. To do this you must type in "IMGMOUNT", the letter of the cd drive you installed the game with (If you didn't install the game mount the image to any letter.), the path of the virtual disc image, and "-t iso". Mount your hard drive and access it.
3. This is probably the best part. Run the game and enjoy!
I hope this was helpful!