Mutlimedia buttons not opening in IE, but AOL how to change it?

I have a HP pavilion with the multimedia buttons. I have the internet, search, info and email button as well..how come when I press them it only opens the selections in AOL? How do I change it so it will just use internet explorer. I have set IE as my default web browser but it wont fit it. and how do you get rid of AOL from your startup programs i hate that it runs and i dont use it i cant seem to figure out how to remove it from the tray.