Full System Scan Is Not Possible

Hi! I have Bitdefender antivirus free edition. From four days then I want to do a full system scan,Bitdefender say queque and i can't do the scan.I don't have any virus and Bitdefender has worked well so far.


I tried to fix the problem by repairing antivirus, with the repairing bitdefender can do full system scan without any problems.


But the day after I have the same problem.


I repaired it again for doing full system scan, but I can't continue to fix it any day.


What can I do permanently solve the problem?


Please help me please,thanks.