This is absolutely impossible, for example, because there is no a way to disable Ctrl+Alt+Delete — the system won't let it no matter what you do.
I'm not sure that global disable of anything else is possible, but you should not try to disrupt OS that much. The whole idea is bad.
Unfortunately, you did not share you ultimate purpose. You should always start with it. So, it's hard to advise anything else, but maybe what you want is the "Kiosk mode"? Please see:
Running a Web Site in Kiosk Mode with C#
c# program ctrl-alt-del screen windows 7