Any careless behavior will bring in Pop-up. If it is something I should be avoiding, any advice on how to stop the pop up's? When Combo Cleaner Anti-virus is installed, you could Start Scan your Mac to search all virus and malware on Antivirus tab. So far I've ignored it, but it continues to pop up. The pop up recommends I download 'Mac Adware Cleaner' and I'm not sure whether it is a legitimate source or whether to ignore it.