How to uninstall AVG free

I had problem of 'can't update because another program running'. I couldn't uninstall via add/remove programs, so I downloaded and ran the uninstaller from this forum. This failed. Not only did it fail to remove AVG free, but now the program 'won't update because the app is corrupted'. 

I want to remove AVG altogether to use windows defender or remove it to re-install AVG free.  Can you help? The op system is a recently upgraded Win 10 on a 64bit processor.

Any ideas how to at least start again by uninstalling a corrupted AVG free?

Trevor, Have a look @ this article (http://avgclick.me/InstallIsRunning).
AVG Guru