Can't uninstall AVG Free

Hi, I really hope someone can help as I am having a terrible time trying to uninstall AVG Free? I have tried all the recommendations and nothing works. I have tried the AVG Clear tool and AVG Remover tool, both in Safe mode and normal mode, and I have tried manually removing the files. Whenever I try and install my new antivirus, it says "Potentially incompatible software found. AVG Update Helper was detected on your system." I really don't know what else I can try, and I would really appreciate some help with this as I really need it gone? 
Thanks

Hello K T.
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