continuously rebooted

I turned on the Bluetooth of my Sony ericsson (live with walkman) today and the phone instantly went to reboot screen, and then it continuously rebooted. I connected the phone to my laptop to create a backup on the laptop but USB cable didn't pick my phone, although it charged via laptop.

My phone is running on Android 4.0.

Please help me as this is seriously pissing me off now. I can't find a way to get my phone back!