Problem in thread.

Question

Is there any way possible in a windows application project to kill the default current thread of the project and run a new thread and then relate the project to it?

My case scenario:-
I have a startup form. In its Load event I want to kill the current thread, create a new thread and run the project through the new thread. This'll be applicable in closing the startup form and open another form. When I run,  the new thread is being created, everything is ok. But as soon as the default/current thread is being killed the application is closing down. How can I tackle this? Provided, I don't want to hide the startup form or stuffs like that.
Plz help. Regards.