play Theme Hospital with lots of improvements made to the original version, support for screen resolutions found on modern machines (up to 1920x1080), and even some additional bug fixes. That said, if as usual you use the demo instead of paying for the full game, you won't be able to enjoy all the features.
Corsix-TH is an essential tool to enjoy the brilliant Theme Hospital. Not only does it let you run it on any operating system, it also substantially improves the experience.