Macintoshhelpcentre.com is a deceptive site that is known to display the multitude of really scary alerts through all popular browsers, both in Windows and Mac operating systems. It’s quite likely that such pop-ups are produced by presence of some adware in your computer, which surely acts in a very aggressive manner. It may be concealed deeply in your computer, so definitely you ought to be very careful to undertake appropriate measures to get rid of it in an effective way. Please follow this tutorial below for more detailed information on how to fix your system.