Questions about NT Service

Ok, I've done some searching on here and all I've seen is people making specific services. I have an application made already that we'd like to have run without logging in to windows, which I assume requires a service.

So is there some registry entry that needs to be made to make it run as soon as the computer is booted? Power is sometimes cut to these computers and we do not have UPS systems on them.

So can anyone tell me how to make this work?

Ok, so I've downloaded the following project and changed the parameters to reflect a program that I've written.

http://www.freevbcode.com/ShowCode.asp?ID=4317

It installs the program as a service (meaning it shows up in the services list). However, it won't let me start it. Do I need to do something to my program to make it work like a service? And this is an unattended application, but it does have a UI.

Help?!