How do you install a game from your HD?

[Birdman]

To make a long story short my Legitmant Unreal Tournament CD got scratched up and is missing a file, I had a friend email me the file and I copied the entire CD to my HD I then put the missing file where it belongs but my question is how do I install it from the HD?

Is there a program to trick windows into thinking my UTCD directory is my CDROM drive? lil help here?