Daemon Tools wont work?

My friend gave me a copy of his Oblivion game image and told me to download Daemon Tools. So I did, and I was able to mount it onto a virtual drive. But when my friend does it, it automatically starts the game. When I mount it on my computer, it directs me to the Oblivion folder and shows its subfolders and files. I tried tinkering around with it but I still cant get the game to start. Thanks for any help whatsoever.