Allow people to use my machine safely (Not change anything)

Ok, so i want to set up a machine just like this one in the video. [login to view URL] I want to allow people to run certain programs on my machine safely. Imaging people connecting to my computer and wanting to cause damage. I want to completely disable that. For example disable people from being able to change ip address, delete other peoples files, disable people from installing programs. That's all i can really think of, but you will need to disable as much as possible. You will need to connect to the server via VNCViewer so i can record what you are doing for future use and monitor exactly what your doing. I think this is a pretty simple project, i doubt it will take more than 1 hour but then again i don't know anything about this.