About Backdoor.Poison.BQA Fake Alert:
Backdoor.Poison.BQA is a name assigned by fake BitDefender antivirus to inexistent detections. The name also occurs in a range of other fake antivirus tools.
It is mentioned in Resident Shield warning that defines the infection as a backdoor and suggests clicking Remove All button. Following the advice will bring you to the adware online activation page. The page will demand you to provide your credit card details, which in no way should be done. Get rid of Bacdoor.Poison.BQA is as that is the only way to make the annoying and misleading popup disappear. Even if the adware is activated, the popup is not eliminated, nothing to say that you need to consider your credit card compromised.
The fake detection is typically mentioned together with Darkmoon Rat, which is also a name invented by online blackmailers to scare users into thinking there is a real issue to deal with.
Proper method for removal of Backdoor.Poison.BQA annoying popup through the related adware extermination is available here (free scanner launching link).