BestsellerAntivirus is a fake spyware removal application that pretends to be a legal and reliable anti-spyware application. Usually, BestsellerAntivirus is installed by a Trojan Zlob, through browser security exploits, or may come bundled with other malware. Once it is installed, BestsellerAntivirus will attempt to goad you into buying the full version of BestsellerAntivirus program by displaying fake warning alerts claiming that your PC is infected. It is very difficult to remove BestsellerAntivirus manually because it has the ability to reappear after the removal.