First of all, you'll need to install a Telnet client - you can do this via Control Panel > Programs > Turn Windows Features on or off > Now check the Telnet client box and click ok.
You will now be able to use the telnet application via the command prompt.
These tutorials will show you how to connect to a telnet server:
Ian gave me this fix I hope it helps you like it did for me. Just go to Start type cmd and type sfc /scannow, it take a few minutes to complete but it allowed me to install Telnet just fine.