How Do I Get Rid of Malware Protection 360 Popup from Computer?

Pop up shows on launching Chrome each time I launch it after a restart. Running Windows 8.1 with Chrome. My son probably downloaded this while downloading dodgy minecraft packs or extension. McAfee has not picked up anything. I have cleaned up a ton of Chrome extensions and unwanted software on W8. But this pop-up still pops up. Help?

What is Malware Protection 360 Popup?

Malware Protection 360 is a potentially unwanted program (PUP) or adware that usually appear as a popup on the web browsers installed on your computer. It claims to scan and remove any malware found on your computer. However, you are not recommended to click “Clean Now” button. Otherwise, you will be ether redirected to suspected website or forced to download PUPs to your computer.