Try doing a clean boot and then test the game (running as administrator). Click Start, or hit WinKey-R, type in msconfig and hit enter; in the General tab, click Selective Startup, uncheck Load startup items (if required) and leave Load system services and Use original boot configuration options checked. Next, Click on the Services tab, check the box to Hide all Microsoft services, then click the Disable All button, then click OK and reboot the computer.
Run msconfig again to switch back to the normal boot configuration.
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 the following command and hit Enter
netsh winsock reset
- when that is done, there should be a message 'Winsock reset completed successfully'
- type exit and hit Enter, then reboot your computer.
For more details, see:
https://iihelp.iinet.net.au/Resetting_Network_Adapter_(Winsock_Reset)
It is a different problem, but if you have a Bigfoot network adapter, see the D:OS topic
Killer Networks NIC and can't load the game? Fix!.