Installing Games

Dear /comp/
I was wondering how to install a game like halo on a computer in which I am not allowed to modify the registry, on a windows 2000 computer. Everytime I try to install it, I get an error saying administrative access. This is a school computer so I can't reinstall anything. The teacher is allowing me to do this as long as I finish my work on time and find any way to install it.
Any help welcome.

Not possible. some games are designed to set their own settings in registry. you will need to write to registry if you want to install