Hi Lewis, as I have mentioned to Matt, Positive Finds originates from a well known adware family called SuperWeb. This infection was recently updated so this explains the lack of detection by popular anti-malware/adware programs (including AdwCleaner and Malwarebytes). I would guess that the detections of this adware will be added in a couple of days and you will be able to remove this potentially unwanted program after updating either AdwCleaner or Malwarebytes. You can also scan your computer with Spyhunter (it's a payed anti-malware, be sure to check if it detects the latest variant of Positive Finds adware before purchasing it's full version to remove this threat).