Solution
Open C:\ProgramFiles and delete the Bitdefender folder
Open C:\ProgramData and delete the Bitdefender folder (also the *.bdinstall.bin files you have here)
Open Registry Editor with administrative privileges and delete from Computer\HKEY_LOCAL_MACHINE\SOFTWARE\ the Bitdefender Entry and Endpoint Security (if available).
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\BdDci" type="REG_SZ" value="Bitdefender BdDci Firewall"
HKEY_LOCAL_MACHINE\SOFTWARE\Bitdefender\Endpoint Security\Bdec" type="REG_SZ" value="5cac617c0d21ea750b04a897"