Can't uninstall after upgrading to Win 10

Hi,

I was prompted by AVG to update the program and when I tried to do so, it says that the file is corrupted. I've tried to uninstall AVG and install the latest version and it says that the product was not installed and therefore request to uninstall was ignored.

What should I do in this case? I couldn't update it and I couldn't uninstall the corrupted file in order to install a new version.

Thank you for your kind assistance in advance!