You don't need a crack for the game. I too was in your position 2 days ago. I burned the ISO and installed the game. When I went to play the game I received the "Insert CD" message. After a little investigation, I determined that Nero (the program I used to burn the ISO) was only burning the 1st data track of the ISO. I also tried Isobuster with the same results.

The Mat Hoffman ISO is comprised of two tracks: 1) data track (which allows you to install the game) 2) audio track (game soundtrack). The problem lies in the fact that if you only burn the first track, the game will install, but not play (insert CD message).

I solved my problem by using Fireburner to burn the image. The program successfully burned both tracks, and the game now runs like a champ (I didn't even have to reinstall). My guess is that the program looks for the audio track, and if your CD is burned with only the data track, you'll receive the "insert CD" message.

Hope this helps.