I have a very old PC with Windows XP. Having looked at the video about Comodo Firewall and wannacry, I tried to install Comodo Firewall (last version) by downloading from here https://forums.comodo.com/news-announcements-feedback-cis/comodo-internet-security-v10016209-released-t118704.0.html .
Well…it doesn’t work. Comodo Firewall 10 prevents explorer.exe to work. I mean: blue screen. Even if I manually force explorer.exe to start (from Task Manager: Run explorer.exe), explorer.exe doesn’t start. Process CPU 0%. explorer.exe is killed (I guess by the firewall).