I don't use telnet but a friend of mine asked about it to play with some commands. I noticed that in widows 7 its not working, then i came across a short trick to enable it since it not secure thats why windows 7 disabled it also in case of vista but don't worry here is a small way:
3.Programs And Features
4.Turn Windows features on or off
5.Check Telnet Client
Hope it may help you someday!
Tags: How It Works