Have you tried starting it from the executable file instead of desktop/start menu shortcut? Does it do the same thing?
If yes, try disabling Norton AV before starting BC just to test how it behaves.
And check the event logs of Windows (Administrative Tools–>Event Viewer, especially the Application, System and Antivirus sections) for any events occurring at the exact moment when you try to start BC.
Also, please look in the task manager and see if there is any BC process, to check if BC starts without loading the GUI or it doesn’t start at all.