Most of the DMPs just show the windows kernal which is basically a "catch-all" non-descriptive error but one does mention your A/V. Try uninstalling your Bitdefender A/V. Maybe try Microsoft Security Essentials for a week or so. If replacing your A/V doesn't help you can always reinstall the old one.
I always recommend a virus scan in safe mode so you might do that before uninstalling Bitdefender. See
HERE.
The most common cause of BSODs is out-dated drivers or BIOS so you should also visit your computer manufacturers website and make sure you have the latest BIOS and drivers.