​​Symptom:

When trying to access telnet, from Start/Run or Command Prompt, an error occurs stating telnet

is not a valid command.

Cause:

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.

Resolution:

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.