Adding program to startup

I want to know how to code a program that will add itself to startup once it has installed on a machine. I am trying to make a scary program that will run every time my friend starts up his computer but i dont know what the right code is to make it do it. Can some one please help me and give me an example code on how this will work for visual studios 2005. And i want the program to add itself to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\Curr entVersion\Run\

Find yourself some recent registry code somewhere out there; that will be the easiest way. Otherwise you'll have to work with the win32 api.
I'm sure someone can help you code that, but it will be much easier if you actually used a registry solution that exists somewhere, like CodeProject.

Did you check the MSDN?
http://msdn2.microsoft.com/en-us/library/aa363634.aspx

thanks i think i have it now :)

You might want to consider whether such things as computer mis-use are illegal in your jurisdiction, whether your skills are sufficient to write a program which won't hose your friends entire machine (by accident), or whether your friend (perhaps soon to be ex-friend) won't be provoked into an expensive course of action to repair the "damage".