Bitdefender being an IT software has its own technical issues to handle and for efficient performance of the antivirus it is compulsory to see to it that the antivirus is free of all technical glitches. If in case you receive the above given error message on your system display that means there is some other antivirus software running on your system therefore, first of all get all other software uninstalled from your system and then further conduct a repair of Bitdefender . This will most probably shoot the error away. However for more information reach expert at: http://antivirusphonenumber.co.uk/bit-defender.html