Uninstalling avg 2015 paid version and installing the free

I renewed my license for AVG internet security 2015.  It took forever for my computer to go to web pages open email.   So I requested a refund which I did get.  Thank you.     I used the uninstaller for AVG, when I go into my Control Panel it shows that AVG isnt listed, but when I go to install the Free version of AVG it says my old AVG is still there and wont let me install the free version.