1. Click on and then select Control Panel .
2. Click on Program and Features icon.
3. You will see Turn Windows features on or off at the left panel, click on it.
4. Windows Vista will prompt AUC to ask for the permission to continue, click Continue to proceed the next step.
5. Then, a window will prompt up. Scoll down and click on the checkbox beside Telnet Client. Lastly, click OK to enable it. It might take couples of minutes to complete.