After installing Launcher Pro and hitting the home key the very first time after installing, did you get a popup window asking you to choose between the default Home and Launcher Pro?
Next thing to try - delete Launcher Pro and download ADW Launcher. Does the same thing as LP, just different look and options for a home launcher replacement app. Pay particular attention to pressing the home button the very first time after installing ADW and see if you get the popup to choose a home application. If not, you're definitely going to want to try a factory reset, and failing that, a visit to vzw.
Next thing to try - delete Launcher Pro and download ADW Launcher. Does the same thing as LP, just different look and options for a home launcher replacement app. Pay particular attention to pressing the home button the very first time after installing ADW and see if you get the popup to choose a home application. If not, you're definitely going to want to try a factory reset, and failing that, a visit to vzw.