Overall Question about ISObuster with games

[alphaproject]

I currently have copied Sim City 4 onto my girl's harddrive since the burning CD's wasn't going so good.

I have both images fully extracted onto the hard drive, now here is the main question and I hope someone has a definite answer.

While SC4 is installing, when it comes to the mid point of installation, it asks me to insert CD 2, but it's already extracted to the same directory that CD 1 is on. How do I get it to either keep on going by itself or alter some file so it routes to the hard drive instead of the CD drive so the game can install correctly?

If it's absolutely necessary to make a copy of the ISO onto a CD I guess I'll have another go at it, but it's just going to take more time than I wanted since everything is already on her computer right now.