... Also see KB17877-How to start a BlackBerry smartphone in safe mode
If you can manage to boot in safe mode, do a full backup.
If you can't manage to boot in safe mode, then nothing else to do.
Wipe, reinstall the OS, the restore your latest backup. (Hopefully you've been doing regular backups. If not, start so you are prepare if this ever happens again.) Posted via BlackBerryForums.com Mobile