Welp, that's where I got TnC as well way back when.
At this point your computer sounds like it's having a program conflict, preventing the game from running the installer. It could be an antivirus program, or another program that starts when you restart the computer. InstallShield is a separate program that runs the installer, and can have issues starting when something conflicts with it.
Hmm, well... Have you heard of "Safe Mode" for Windows?
https://support.microsoft.com/en-ca/...c-in-safe-mode
Try restarting your computer into Safe Mode and try running the installer again. (From either Daemon Tools or VCD.)
If the two mounting programs don't work, there's always the choice of temporarily starting your computer with a "Clean Boot". It's a bit more advanced, and takes some work to get your computer back to the way it was before, but both of these methods are meant to try and prevent any program conflicts that might be stopping the installer from working on your computer.
https://support.microsoft.com/en-us/...oot-in-windows