I had the same problem when I was mounting the iso for the first time. The problem you are having may have to do with the version of daemon tools you are using. First of all do you have all the bios and everything is set up well on you chankast. If so then it is you daemon tools. When I finally got my chankast to work with daemon tools it would work until I turned my computer off and then it would read any iso as an audio file. Then I would have to reinstall daemon tools for the game to work again. I tried version 3.29 which is the one I am using now all the way to 3.46. They all did the same thing. What I found to be most usefull if this keeps happening is to burn the image to a disk then pick that as the drive that chankast will be reading. I know this will work. It will pop up as an audio cd but it will work. If you don't want to do that then maybe you should try to use Alcohol120. Haven't tried it myself but it could work since it is basically the same as daemon tools.