I don’t think that NeT Firewall may affect MySQL start (firewall works on the packet level and does not directly affect socket creation), probably this is something else. If you suspect NeT Firewall try to remove it and see if MySQL starts. Alternatively you can also select to unload rules on the exit in the options and shutdown the console. Or even just put all interfaces to Low Security and remove all rules. This disables any packet filtering.
However, As I have mentioned NeT Firewall can’t affect MySQL start, it can only block external access to ports used by MySQL.