Registry

Question

hi all I'm writing a program in C# that monitors and controls user's access to the computer , logs in keyboard keystrokes and takes a snapshot of the user's desktop. Now I'm trying to write the code to modify the registry to allow my program to load with the operating system and run the instance a spicific user logs into the system. I'm really in great need for help since I'm not sure what functions and classes to use to achieve this goal. I'm writing this program as a graduation project and the deadline is getting near so any help will be very greatly appreciated.