Turbo C++ is not compatible with Windows 8. You will need an application that emulates DOS operating system. Luckily, there is one called DOSBox. Install DOSBox that works in Windows 8.1 then place the TURBO C++ files into a folder (let's say C:\turbo).
From the DOSBox terminal, type: mount C: C:\turbo. Once it's mounted, navigate to turbo folder using CD C:\turbo and then you can launch the installation.
Notice that you'll have to mount the folder each time you want to start Turbo C++.
