Edward, Uninstall / reinstall…
[1] (http://support.avg.com/SupportArticleView?urlname=How-to-uninstall-AVG-AntiVirus-for-Mac)
[2] (https://support.avg.com/SupportArticleView?l=en&q=install+avg+for+mac&urlName=How-to-download-and-install-AVG-AntiVirus-for-Mac)
AVG Guru
How do I uninstall and reinstall avg on Macbook Air?