Starting program before windows loads?

I've written a simple speaker identification system, and I wanted to demo it by showing that it could be used to login to a computer. Is there a simple way to make my program run before windows finishes starting, as the "login" screen does?

Any ideas would be appreciated.

Thanks,

David

The logon screen is part of Windows. You can set your program as a service, and it will load as soon as Windows is running (which means it finished "starting"), or you can design your program as an operating system and run it instead of Windows. But what's going to load it if Windows is still starting? The bootloader loads the operating system - the next "loader" is Windows itself, after it finishes "starting".

(You could write your app as part of Windows, but a) not in VB and b) no one would use it.)