When i try to make my intro, my blender keeps on rendering and then when it's done, it starts all over repeatedly. I waited a while and it keeps on doing the same thing for like an hour.
As said by Bithur in the comments, it is quite possible that you are rendering an animation. Stop the current render with the Escape key. Then press F12 (make sure that you don't press Control+F12 by accident!), or go to
Render Image from the toolbar.
If it continues to do the same, go into the render settings and make sure that
Sampled motion blur is unchecked. If even this doesn't help make the render finish, uncheck
Anti-Aliasing (I am not really sure this will help, but you can try...).