How to remove Pop-up (Mac) pop-up is a malware, that will redirect browsers and display following error “IMMEDIATE ACTION REQUIRED; SCAN IN PROGRESS; Press OK to begin the support process.” to trick users. This malicious program is targeting only Mac OS users. It’s created to make people think that their computer is infected with a spyware virus, which is huge and dangerous thing. We assure you, that there is nothing wrong with your computer, it’s a blind threat. In this article you may learn how to remove pop-up.