1. Push the 'Windows' key 'R' on your keyboard. This loads a 'Run' box.
2. Type 'CMD' without the quotes. This loads your command prompt.

3. Press the 'OK' button.
4. Type 'Ipconfig /flushdns' without the quotes.
5. Press 'Enter' to execute the command. Close the command prompt once you see the message, 'Successfully flushed the DNS resolver cache'.