Wirelessly posted
Before you reload the OS ...
If you are using OS version 4.6 or later, try booting in safe mode. That should allow you at least to run a backup. You may also be able to remove the app that is causing the problem -- or remove what you suspect is the problem -- and try again.
See
http://docs.blackberry.com/en/smartp..._411242_11.jsp for insructions for booting in safe mode.