AVG is horrendous
I installed AVG Free 2018. Downloaded from AVG website. Entered the OP's serial number. Works fine. Installed on laptop and PC. Valid for one year.
Sorry but I do not trust Microsoft to protect itself from viruses which exploit the vulnerabilities of the microsoft OS
Did you put the license in correctly and it's listed in the window? As I said above, this might not work if you have had any AVG antivirus/internet security on your computer before, trial version, free version or paid version.
No states 1 month 11/21/2017