I seldom use my own laptop for office work until today when i need to use it to telnet to some equipment to shutdown and to my surprise, there is no Telnet for my laptop which is running Windows Vista. Luckily this feature is disable but not taken away. To enable back, simply go to Control Panel -> Programs and Features -> Turn Windows features on or off. A windows will pop up and from the list, just click the Telnet Client and that's it, you have your telnet back. :)