AVG Free installation error

I've been facing issues with the Technical Support Chat, it's always stuck at the loading page after I submit my query.

About a month ago, I downloaded AVG Zen instead of AVG Free. I uninstalled AVG Zen from the Control Panel>Programs>Uninstall, and I've also run the AVG Remover program. I've tried installing AVG Free many times, but this error code keeps appearing: Event exec_finished with the code 0xC0070643. How can I fix this problem? 

Hello Amelia.
I apologize for the inconvenience that you have faced so far. In order to make the resolution easy for you, I have sent you an email. Please check your inbox and you will be good to go.
Thank you.