Go to Control Panel\Network and Internet\Network Connections
Right-click on your network connection > Select “Properties” > Uninstall “COMODO Internet Security Firewall Driver”
Restart computer system
Run “Diagnostics” tool
I did step 1. but when I clicked restart-button, I had Bluescreen. Then I did other steps (my drivers are up-to-date already) but I still have the same issue. Currently, Avast is not installed anymore so apparently it’s not the one to blame.