Here is a way to install DCU without the original CD; make a silent Installation!
1. Mount the iso-file by the free software
WinCDEmu mounter (or a similar program). Disable autorun.
2. By Explorer navigate to the BIN folder (inside the iso-file)
3. Type in "cmd" in the address bar (+enter) or Shift+right click the BIN folder and select "Open Command Prompt here"...
4. Run either the 32 or 64 version of the installation in silent mode by this command:
>
setupXX.exe /s /LANG="en"
(Replace XX with your version of windows, and press ENTER).
In this way you will make a default installation of DCU directly. And not ask for any original CD. (perhaps the last part, /LANG="en" , is not neccessary. Good luck!