http://www.leateds.com/2009/telnet-for-windows-vista-windows-7/
Posted on January 25, 2009 by Sean
A while back I noticed that on Windows Vista there was no Telnet, the reason for this is that telnet is not secure and they decided to leave it out because they were trying to update their level of security. In windows 7 it’s the same thing, it has no telnet.
I have now found out how to get telnet on windows vista and windows 7. It is really simple and is done like this:
Then it will simply work as normal. Hope this helps!