Open the Control Panel by pressing ⊞ + R to open the Run menu, typing "Control Panel," and pressing Enter. Go to "Programs" and click on "Turn Windows features on or off." Check the box for "Telnet Client" and click "OK" to install the Telnet client. Once installed, open cmd To connect to telehack, type: telnet telehack and press Enter, once you have done that you are on the telehack servers!