1- if the files are .zip, extract them to a diffrent folder useing winzip or something like that
2- mount the image file with daemon tools
3- it should automaticaly start the setup procces as if you've just put in the original cd in the computer
4- if nessecery open the folder typed "crack" (by going onto my computer and right click the cd directory and then "open") copy all those files and paste them in the game directory, replacing the existing files.
thats about it.