Threat secured pop up alert

Hello Beverley,
We sincerely apologize for the difficulties you are currently experiencing.
We will certainly check and help you with this.
In order to assist you better, could you please provide the screenshot of the threat pop-up windows which appears on your Mac PC. 
Please let us know whether you've installed/downloaded any unknown files or applications on your PC.
Have you made any recent changes to your system? 
Also, please share the version of the AVG AntiVirus on your PC. (AVG AntiVirus>Menu>About)
Thank you.

I have a mac desktop and suddenly today I have started getting threat secured pop up alerts every few seconds.  It is driving me mad.  There is nothing in settings to allow me to turn this onto silent.  I don't need to be told every time AVG does it's job.  I've looked on the web and it seems that it is impossible to stop this now it has started.  Do I have to go for a completely different security system and accept I've wasted my money on AVG and just uninstall it

Hello Beverley,
We sincerely apologize for the difficulties you are currently experiencing.
We will certainly check and help you with this.
In order to assist you better, could you please provide the screenshot of the threat pop-up windows which appears on your Mac PC. 
Please let us know whether you've installed/downloaded any unknown files or applications on your PC.
Have you made any recent changes to your system? 
Also, please share the version of the AVG AntiVirus on your PC. (AVG AntiVirus>Menu>About)
Thank you.