newbie needs help with backup instructions

[chemtype]

the readme file in the no-cd file i downloaded from this site read... "Copy Files Into Hitman Directory Including Hidden File!
Then Run The RegSetup From Hitman Directory
Then Goto Hitman Directory And Run Setup.Exe
Then Play!"
If i have saved the contents of the cd in a separate file in my documents, what do i do then? i have tried every which way but loose and still get the "insert the correct cd" message. i haven't had much joy copying anything so i am obviously going wrong somewhere.
any help will be much appreciated!