An error occurred while attempting to change modules while starting up LR 4.1. New install on a new MBP first time trying to start up
Just a guess, but since everything is new, perhaps you have some sort of permissions problem.
Make sure your user has write access to all the locations mentioned in this link:
http://helpx.adobe.com/lightroom/kb/preference-file-locations-lightroo m-4.html
Hal
North America
Europe, Middle East and Africa
Asia Pacific