If the game hangs on the loading screen when starting a new game, and you get a 'Network initialization failed' error clicking on Join from the main menu, try
resetting your network adapter.
- click Start (or Search in Win 10), type cmd into the search box, right click Command Prompt and select run as administrator.
- type
netsh winsock reset and hit Enter
- when that is done, there should be a message 'Winsock reset completed successfully'
- type exit and hit Enter, then reboot your computer.