Run command line:

• from address-panel: →cmd.exe
•   through Windows icon: search files&programs → type CMD or Command Prompt
•  using Run function: → cmd.exe
• either searching "Command Shell"
   

Inside of command window following strings should be executed:

netsh winsock reset

netsh int ip reset

• TCP - transmission control protocol
• IP - internet-protocol
• UDP - user datagram protocol
• NAT - network address translation