[TippeX]

then you need to remove the protection dont you...
the protection checks the disk for a signature, if its not present, it won't continue until either the disk becomes present, or you click cancel and it exits...

so the only way you can use your 'own' cd image is to use the cracked executable, or use a mini / maxi image...

protections generally don't store the cd drive letter in the registry.. its not that simple...