To enable Telnet:
The 'WIndows way':
Open your Control Panel then click on Uninstall or Change a Program > Turn Windows Features On or Off.
To enable Telnet, just check the box labeled Telnet Client and Telnet Server then click on the OK button.
Windows will take a few seconds to install the Telnet feature after which you will be able to use this program on Windows.
The Command Prompt way:
At an administrative level command prompt, simply run one of the following commands:
dism /online /Enable-Feature /FeatureName:TelnetClient
Search for 'CMD'
Right click on cmd.exe and run as administrator
Once the command prompt window has opened, type in one of the above commands and press Enter
To open a Telnet session:
Open CMD (As shown in previous steps)
Type telnet and press ENTER. The Telnet> prompt is displayed.