I have a previous post about installing telnet.exe in windows 7, however, I explain how to do it using the UI. You may need to install telnet.exe from the command line.
To install telnet.exe on Windows 7 from the command line, run this command:
C:\Windows\system32>dism.exe /online /Enable-Feature:TelnetClient
Yes, it is that easy. Of course, you may think about using ssh these days as telnet just isn’t that secure.