ok the program is Installshield (version 10 is the one used at work, but I believe there is a newer one now)
it was relatively easy for COD, with a hell of a lot of testing from Grumpy & Reddragon.
the program itself is virtually wizard run but does need some modifying after, however you need to know what reg keys and such the game makes, you can use a tool called regmon to find this out
there are quite a few games that can't be converted to dvd because of the setup routine used, ie Call of Duty, so if you feel like using a good few days up and spending a bit of cash on the software I'm sure there will be plenty of people who would be very grateful.
I was going to look at Soldier Of Fortune 2 but just not had the time lately, if I get time i will do.
oh and I didn't crack it mate, I just worked around it
EDIT: the link for the software:
http://www.installshield.com/products/installshield/
http://www.sysinternals.com/Utilities/Regmon.html