install a windows file

I am producing a program that needs certain files from Windows to be installed.  I have worked out how to check if the file is on the hdd and in the right place but what i need to do is have windows install a file from the CD if i find it missing.

anyone know how to get this done?
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RickHalleConnect With a Mentor Commented:
Your best bet is to look at the Windows Installer SDK. It has information regarding installations. In particular look for "Install on demand".

Rick Halle
You need program like installShield... If you have Delphi CD you can find InstallShield Delphi edition on that CD. The installer will install all necessary files to your destination computer.
mantra246Author Commented:
Thanks Urosy, but i need to be able to install a file from the Window CD once my program has been installed and checks to see if the needed file is there.

example:  Imagine i wanted to ensure the user had notepad.exe installed before i let my program open a txt file.  If the program found that it did not exist on the system then it would install it from the Window CD.  Same if it found a DLL file missing from the Windows folder, the program would re-install it from the Windows CD.

I am sure there must be a call somewhere (or small peice of code) to get windows to do it - i just can't figure out how.

Any ideas on how to do it?
listening :-)
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