How to move Quark software from one computer to another?

I have QuarkXPress on one computer. This computer runs on Windows 2000 and has 2 hard drives installed. When I try to open Quark on this computer it says that “QuarkXPress 7.0 requires the computer to be running Windows XP or higher”.

I cannot locate the disk of Quark. But I have another computer with Windows XP on it. So I want to move Quark from the computer with Windows 2000 to another computer that runs on Windows XP.

Questions: How should I move Quark from the computer it is currently on to another which has the capacity for it to run? Should I try to save Quark on to a CD or a portable hard-drive? Is there some other way to save it? Which files do I need to save (there are many)?

OR: Should I try to remove one of the hard drives from the computer that has Quark and re-install it on another computer?