Is this game Black & White that you are trying to crack.
To remove the read only protection, right click on the files, choose properties and then uncheck Read-only.
However, I suggest you forget about the above method for the time being as using i6comp can be complicated to begin with. I suggest you do this:
1) Create a temporary directory
2) Copy contents of cd to the temp directory
3) Create a folder named 'Crack' in the temp directory
4) In this Crack folder, put the cracked exe file that you downloaded
5) Burn the contents of the temp directory back to CD-R using the
same cd-label as the original.
Now when you want to install the game you will have to:
1) Install - always a good start
2) Goto the crack folder on the cd that you created
3) Copy the cracked exe from there into the game directory (wherever the game was installed to). It will ask you do you wish to overwrite the file, you click Yes
4) Play the game.
[Edit]
Tippex - you type faster than me