Did you notice that Windows Vista fresh install do not have telnet client by default?

How to install it? Easy…

From Windows Vista desktop:
[*] Click “Start” menu
[*] Then “Control Panel”
[*] Then “Programs and Features”
[*] Click the “Turn Windows feature on or off” link on the left sidebar
[*] If UAC enabled,, click “Continue”
[*] Scroll down, place a check mark on “Telnet Client”
[*] Click the “OK” button and wait a few moment while Vista installing the software
[*] Done.
Good luck!