error 'insert cd in dvd-rom drive'

[swedishchef]

I found this in my readme file :
1. Unrar.
2. Burn the image.
3. Install the game.
4. Copy the cracked executable over from the Crack directory on the DVD to your installation directory.
5. Play the game.

A friend told me to use DT to mount image. I did that, I installed the game, everything went well but when i click play it says I have to 'insert a cd'...
Help pls?
I don't understand the 5 steps?I'm new at this so...

thanks