This may have been a failed firmware update. If it is, the following steps to reset the device should allow you to use it again after setup.
A master reset will result in the loss of all settings stored on the device.
This type of reset should only be used as a last resort after all other troubleshooting steps have been exhausted.
From the home screen, press the Menu key.
Scroll to Settings and press the Select key.
Scroll to Reset Settings and press the Select key.
To reset the handset, press the Reset key.
Note: Reset Settings will delete all settings stored on the device.
The device will completely reset.
Then go through the setup again and all should behave normally.