Help address book fiasco


I don't know where to start. At some point, accidentally, I made address book the default program for using the phone function on my Incredible. It's much harder to use, is constantly sending crash messages even when I am not doing anything that involves that program, and most recently, with the most recent update, when I go to Contacts, it offers to let me add a business contact but won't let me see my contacts, even though it says it is displaying 50-some contacts!
I hate this program and would like to go back to being able to use my phone with the original Phone program as default. Can anybody tell me how to do it please. Thanks.