In Windows Vista the telnet command line client is disabled by default for security reasons.
To enable it:
Go to Control Panel, Programs, "Turn Windows features on or off", and tick the "Telnet Client" option.
Welcome to MUNDY.CO - IT Knowledgebase written by Daniel Mundy from Adelaide, Australia.
Need help with anything? Email
This email address is being protected from spambots. You need JavaScript enabled to view it.
or call 0407 175 859.

In Windows Vista the telnet command line client is disabled by default for security reasons.
To enable it:
Go to Control Panel, Programs, "Turn Windows features on or off", and tick the "Telnet Client" option.