The simplest approach would be to write a BAT file to do the copy and call the BAT file from your ISS file. If you're willing and able to learn a bit aout the scripting language built into Inno Setup then you can use functions like FileCopy to copy files from the CD to the HD as part of your setup. Finally you could write your own EXE to perform the file copies for you, but if you knew how to do that I guess you wouldn't be asking for help in the first place!