Matt1 - Why'd he take it away? Ask him for it back! Otherwise - I'm guessing maybe he banned you from using it lol, poor fella! - find it and make an image of it using Alcohol 120%, then mount it (using A120%) so you can play it. He won't even know if you put the disc back . It'll save you hassling with downloads!
@matt1 Making a Disc Image is a great option. But will leave you with a file that is the size of the CD. So I believe depeding on the protection on the disc you can make a "Mini-Image" this in essence takes the full Disc Image and hacks away everything on it you dont need to play it. Then you mount the resulting file with Alcohol 120% or Daemon Tools or any other program of the sort.