NO idea what I'm doing. . .

[crispy]

Also NO, because most apps are compressed on the cd.
Your cd may be 650Mb or less, but the installed game could be many times larger than that.

Couple that with registry entries, temp files in other locations, the simple answer is it won't work.
Your only hope is that the game will install from an imperfect copy but not run. i.e. you can install from a fecked copy, but also have your fixed game.exe file on another cd/floppy and replace the original.