Can you please check out these steps once again and report back. https://support.avg.com/SupportArticleView?q=uninstall+avg+from+mac&urlname=How-to-uninstall-AVG-AntiVirus-for-Mac&l=en_US.
I'm looking on the web to find answers to my proplem and find that there are a lot of discontented people out there with AVG. This program is like a VIRUS that never leaves and I'm not getting any help from the so called AVG Gurus. There should be a very simple answer to this from the developer, you provide a link with the download when you install AVG FREE that lets you uninstall
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AVG Guru