I would surelly suggest to change your AV, BitDefender is too buggy.
Well, an Antivirus can be enough, depending of what kind of user you are.
However, what was your last known malware infection ? What were you infected with ?
As an On-demand Scanner, I would add Malwarebytes, as its always a good software to have. You could also use HitmanPro but I prefer Malwarebytes over it.