By default, Vista doesn’t install the Telnet client.
 The client is for text-based communication with remote systems.
 You can install it by following these steps:

1. Click Start then select Control Panel.
 2. Select Programs and Features.
 3. Select Turn Windows features on or off.
 4. Select the Telnet Client option.
 5. Click OK.
 6. A dialog box will appear to confirm installation. The telnet command should now be available

Did this answer your question?