[2005] Writing an Install script?

I need to write an "Install" script in which it installs an application with it's associated files. It also needs to make sure that the application runs in the background and is executed upon bootup of the PC. Can anyone point me in the right direction for this?

Thanks,

Well what does this install need to do? Some installs just copy files to your hard drive, others edit registry settings, register assemblies, copy files and more. So its a bit hard to just tell you how to create an installer.
Also, are you talking about writing a VB.NET application to install this program or are you talking about creating a non .NET program (e.g C++) that would be used to install a VB.NET app you have made?

Oh and why does it need to run in the background and run when someone starts their PC? Sounds rather similar to what a malicious program would do...