being invaded

I am continuously being bombarded with messages on my MacAir laptop and not sure if genuine . I suspect they are not as they relate to me either having a Virus infection, (and sometimes it states the number of infections) my computer is at risk or "Action required! renew your antivirus subscription" I have so far resisted opening them but now they are becoming a rear persistent nuisance.

I am also suspicious of them since

  1. 1 I have the Bitdefender "total Security" which does my scans and reports no issues
  2. it refers to McAfee Antivirus which I have never (as far as I recall) installed or subscribed to
  3. example screen shots attached