A file in quarantine cannot be deleted

I have an iMac running Sierra 10.12.6
and I'm using AVG AntiVirus Version 2015.0 (4822) (and it's up to date.

Having run the antivirus programme, one file was transferred to quarantine.
It's 'label says, "Could be an adware OSX/Genieo" and further information says it is a "Potentially Unwanted Application".

When I try to delete the file, I get the message "Deleting files... This may take a while."
It sure does!
It's been running for hours without achieving the deletion!

On several occasions I've exited the programme and re-enterd it to see if that would kick-start it.

No luck.

Any suggestions?
 

Hello Adrian,
I understand the inconvenience caused, let's work together to fix this issue. I request you to go to the file location (you will find the location in label) and try to delete that file manually (the quarantine file).
Best regards,
Alok.