system
5
Double clicking on the desktop icon should open the avast GUI. If it doesn’t then your installation isn’t working properly and as I suggested before, you should first try a repair and if that doesn’t work, an uninstall and clean up with AvastClear.exe and a clean new installation. That assumes you properly removed any previous AV you might have had installed prior to Avast, using the appropriate removal and clean up tool for the particular AV.